Submission Number 0 Student Comments Show All Files I Have Uploaded (4 File(S)) Optional File Upload
Centre for Science and Technology Studies Eye for Science and Applied science Studies 2333AL Leiden Zuid Holland 31715273909 https://www.vosviewer.com/
Getting Started
To go started with VOSviewer, you may want to take a wait at some of the sources of information listed below.
Video
VOSviewer manual
The VOSviewer manual provides detailed and up-to-date data on the functionality of VOSviewer. The transmission can also be accessed using the Manual button in VOSviewer.
Open VOSviewer manual
VOSviewer volume chapter
VOSviewer is discussed in detail in a recent book chapter. The chapter provides a tutorial in which the use of VOSviewer is demonstrated in a step-by-pace mode. The chapter is based on VOSviewer version 1.5.5. Some of the improvements and extensions introduced in the most recent versions of VOSviewer are therefore not covered in the chapter. In addition to VOSviewer, the affiliate also discusses the CitNetExplorer tool for visualizing and analyzing citation networks of publications.
Open VOSviewer book chapter
VOSviewer paper
VOSviewer was originally introduced in a paper published in Scientometrics in 2010. In the concurrently, VOSviewer has been improved and extended in many ways, and so the paper is not fully up-to-engagement anymore. However, it even so provides a useful introduction into the main ideas underlying VOSviewer.
Open VOSviewer newspaper
AIDA booklet
The AIDA booklet introduces diverse case studies on research positioning and trend identification. These case studies are relevant for PhD candidates, researchers, grouping leaders, and policy makers. Many of the case studies make employ of VOSviewer.
Open AIDA booklet
Comments
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Ali Rhouma April 10th, 2022 iii:23 pm Beloved Sor,
I have a list of journals published by funded projects and I wanna drew a map of who is working with who (co-publications between countries for instance) and too the principal keywords. Can the software utilize a table generated by our local platform?
Thanks for your aidReply
- Ludo Waltman April 10th, 2022 5:34 pm
You lot could effort to catechumen your information to the format of a VOSviewer map file and a VOSviewer network file. These files types are described in the VOSviewer manual.
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- Faza Fawzan Bastarianto Apr fifth, 2022 12:52 pm
Hullo, I am trying to open up VosViewer through my MacOs. However, it was failed to open every time I tried to open information technology as at that place was an error message "Unable to load Java Runtime Surroundings". Currently, I have installed coffee version "11.0.13" 2021-x-19 LTS on my Mac.
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- ARUN SAXENA April 5th, 2022 4:45 am
Hi Ludo.
Farewell to you. Could yous please help with a link to a adept instance written report that demonstrates interpretation of keyword Co-occurrence and thematic assay in great item with the assist of an case.
Thx.Respond
- LIU CAI April 5th, 2022 4:38 am
Hi!
I'thousand having a wierd issue using VOS, 1.6.18, the windows version. When I open information technology and attempt to upload the files, the pagese get stuck every bit I movement the mouse. For case, the "Ok" push button and the "NEXT" push button disappear, or appear on top of each other, or the file upload box prove repeatly on one page, or the content go completely bare on one page.
I really appreciate it if you can help me with it.Reply
- Daniela Valenzuela Apr 4th, 2022 6:xiii pm
Hi, I am receiving the post-obit error:
Error while reading Lens file: Cannot detect author/s, Keywords, MeSH Terms or References field.
I am downloading information from Lens.org in CSV format. Any help? Thanks in accelerate.Reply
- Catherine Apr 3rd, 2022 3:23 pm
Hello,
I am uploading a text file with excerpts from each document in each line. And so i don't move on to the side by side line unless it'southward an extract from some other certificate. I sympathize that by doing so, the program will read each line every bit a new source/document.
I now just want to clarify the difference between full and binary counting.
For binary, the manual states, "the Occurrences attribute indicates the number of documents in which a term occurs at least one time". Does this hateful that if nosotros opt to choose terms that occur at least twice, the program would then find terms that occur in at least ii documents (or lines)? Or does the plan observe terms that occur at least twice in a certificate?
For full, the transmission states "the full number of occurrences of a term in all documents". Does this mean that if we opt to choose terms that occur at least twice, the program would then find terms that occur at least twice in the entire text file (regardless of whether or not a document/line contains the word)? Or does the program detect terms that occur at least twice in a document?
Thank you.Respond
- Ludo Waltman April 3rd, 2022 6:sixteen pm
In the example of binary counting, VOSviewer will select all terms that occur in at least two documents (regardless of the number of times they occur in these documents). In the example of full counting, VOSviewer will select all terms that occur at least twice in the corpus, either in ii different documents or two times in the same document.
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- Catherine Apr 4th, 2022 3:04 am
Thank you very much for your quick response! To farther clarify, for binary counting: if nosotros opt for i occurrence, so does the line between two terms demonstrate that they both occur in at least the same judgement in a document? And if we opt for two occurrences, then does the line betwixt two terms demonstrate that they both occur in at least the aforementioned sentence in a document or does it hateful at to the lowest degree two same documents? Furthermore, the thicker the line the more frequent that both terms appear together? Give thanks you lot.
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- Ludo Waltman April fourth, 2022 7:15 am
Co-occurrences of terms are identified at the document level, not at the sentence level. A link betwixt two terms therefore indicates that the terms occur together in at to the lowest degree one document, but not necessarily in the same judgement. Indeed, the thicker the line, the larger the number of co-occurrences of two terms.
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- Catherine April 4th, 2022 7:13 pm
I see. And so, for binary counting, if I opt for a minimum of two occurrences, would I be correct then in saying the following statements: "VOSviewer will select all terms that occur in at least 2 documents (regardless of the number of times they occur in these documents)". The more prominent a term is on the map, the more documents this term occurs in. In terms of co-occurrences, if a term is linked to another term on the map, it means that, individually, both terms occur in at least 2 documents (not necessarily the same documents), only they co-occur in at to the lowest degree one document and, the more prominent the link, the more documents they both occur in.
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- Catherine April fifth, 2022 5:51 pm
In improver to my last question I also have the following questions. (1) i uploaded a corpus file into VOSviewer with text from just 1 certificate. i made certain that all the text are in just one line (i utilize Notepad++ which shows you each line that is in use). In this case, for binary counting, obviously the only occurrence is 1. Each identified term also had a relevance score of one.00. Afterwards generating the map, I noticed that non all terms link to all the other terms. Shouldn't they all link to each other given that they are all from the same document and VOSviewer identifies co-occurrences at the document level? (ii) For the thesaurus file: a term in the characterization column must exist a noun phrase (i.e., without a preposition) just it can be replaced past a term with a preposition? So, for case, I cannot supervene upon "quality of life" with "QoL", only I tin supercede "QoL" with "quality of life"? This means that for terms such as "quality of life" and "research and development" i would have to supercede them in the corpus file with noun phrases or abbreviations (such equally QoL and RD) and then that they evidence up in the map? (3) Is there a faster way to obtain a list of terms that VOSviewer identifies with a minimum of 1 occurrence without saving the map.txt file? I noticed that there are long noun phrases that I don't need, but they take short substantive phrases that I exercise need. For example, VOSviewer identifies "artifical neural network", simply i simply want "network". I take it so that I would have to use the thesaurus file to supervene upon "artifical neural network" with "network"? If and then, is there a way to populate the list of terms so that I tin can just re-create them into my thesaurus file and add the "replace by" terms for the labels that I do demand, without having to generate the map in the showtime place? Thank yous for your time in responding to our queries!
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- Catherine April tenth, 2022 12:59 am
How-do-you-do, I simply desire to say that I actually discovered the answer to my 3rd question. In the "Verify selected terms" section of the "Create map" selection, if you lot right click on a term, a pop-upwards menu gives yous the option to export the selected terms.
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- Ludo Waltman Apr 10th, 2022 1:35 pm
(i) Yes, they should indeed all link to each other. Possibly the number of links in your map exceeds the maximum number of links shown by VOSviewer? By default, VOSviewer shows a maximum of 1000 links.
(2) No, I'1000 afraid this is not possible. Prepositions will exist ignored, also when yous use a thesaurus file.
(3) Practiced to hear you lot managed to notice an answer!Reply
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- Ludo Waltman April 10th, 2022 1:19 pm
Yep, this is fully correct.
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- mai Apr 1st, 2022 iii:36 pm
maixiaojunbst@gmail.com
hello. can I ask why the co-occurrence and other choose not available only the co-author can work? the full included reference is 88, and I also update the application to the latest one. thanks for your guys answers.Reply
- Ludo Waltman April 1st, 2022 ten:28 pm
The options available in VOSviewer are dependent on the blazon of data provided equally input to VOSviewer. I am non sure what kind of information you lot are working with, but apparently information for co-occurrence and citation-based analyses is missing.
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- Nurmardhiya Darnalis March 31st, 2022 three:39 am
Hi. I have one question. What if one authors was from 2 countries / institutions? How was this handled in the Vosviewer?
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- Ludo Waltman March 31st, 2022 seven:32 am
Both countries/institutions will exist taken into account. In a co-authorship analysis of countries/institutions, this means the two countries/institutions will exist considered to be co-authors.
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- Zahra Fard March 26th, 2022 7:16 am
Hi!
I have a basic question. If we import bibliographic data files from various sources such as both web of science and scopus, does VOSviewer aggregate the references with recognition of repeated sources?Reply
- Ludo Waltman March 26th, 2022 ix:35 am
I am afraid it is not possible in VOSviewer to combine data from different data sources.
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- Catherine April 5th, 2022 4:13 pm
Depending on how many references you lot have, mayhap you could attempt combining both into one text file; just make sure that you format them the same. I had a minor number of WoS references then I was able to format their biblio data as per Scopus' format (a boring process even with just a small number of references) so add the re-formatted WoS references into your Scopus text file to upload into VOSviewer.
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- AMRUTHA March 24th, 2022 vii:47 am
Hello, while we are working on text data using Vos viewer .we can exclude words merely If one word occur in brusk form and other word in full form. How to add the occurrence of 2 words since two words are same. For instance if total organic carbon occurred in 5 time & Toc(short grade for total organic carbon) occurred in ten times. How to add occurrence, if I exclude whatsoever word total fourth dimension of occurrence is less and consequence is wrong. Is at that place whatever way to add. Kindly aid me
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- Ludo Waltman March 25th, 2022 7:30 pm
Non sure if I understand your question in full detail, simply I recall this issue tin can be addressed past providing a thesaurus file as input to VOSviewer. Yous can use this file to merge different variants of the same term. See the VOSviewer manual for more details.
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- Amin Nasir March 24th, 2022 4:04 am
is very skilful thought
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- Rumiana Koynova March 22nd, 2022 10:23 pm
In the Manual, sample thesaurus files are mentioned - thesaurus_terms.txt and thesaurus_authors.txt
Where can I discover these files?
Thanks!Reply
- Ludo Waltman March 23rd, 2022 x:42 am
When y'all download VOSviewer from the download page on the VOSviewer website, you will obtain a ZIP file that includes the sample thesaurus files.
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- TAEKU WANG March 18th, 2022 8:xl am
hello,
I am a user of the app vosviewer
I have been using vosviewer software for more than a twelvemonth, thank the programmer very much.
At that place is a question virtually the new version of the example. In the example Delineating COVID-xix and Coronavirus Research provided past the website, how is the Topic Modeling in "Using topic modeling we further characterised these four largest clusters." implemented?
I didn't find an caption on the usage of Topic Modeling in your website, promise to get your reply.
cheersReply
- Ludo Waltman March 20th, 2022 8:39 pm
Topic modeling is not supported by VOSviewer. However, there are quite a few tools available to perform topic modeling. My communication is to use ane of these tools.
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- Upendra March 4th, 2022 6:35 am
Thank y'all for the software development.
I hope you are in skillful health and spirit.
I have few queries and questions.
1- After downloading the software I couldn't run the application as information technology shows this error " This awarding requires Java Runtime Surround i.8.0" which I am unable to download. Even the online software is not functioning properly.
2- Secondly, I wanted to do a citation analysis of top 100 manufactures in a specified field; how should I keep with it. How tin can I extract the data to be uploaded on the Software and in what format from the databasesRespond
- Apichai Wattanapisit February 27th, 2022 half-dozen:39 am
Hello,
On the verify selected keywords window, I found both keywords with asterisk signs (*covid-nineteen, *sars-cov-2) and keywords without asterisk signs (e.g., covid-19, sars-cov-ii). Accordingly, the summation of both occurrences (*covid-nineteen (n=274) + covid-19 (n=i,000)) is greater than the total number of search results (due north=1,000).
What are the difference of the keyword with and without asterisk?
Thank you.Respond
- Nadeesha February 26th, 2022 5:27 pm
I desire to consign manually entered bibliographic information set to VOSviewer. which option should I select for "choose type of data"?
Actually, I want to enter total manuscripts in proceedings also. That'due south why I want to do it. I want to practise bibliographic information for relevant keywords only for ane land.Reply
- Ludo Waltman February 26th, 2022 7:24 pm
What practise you mean by a 'manually entered bibliographic information gear up'? You lot need to make sure your data set is provided equally input to VOSviewer in a file format supported by the software. Which file format are you using?
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- K Etemeadi February 23rd, 2022 4:12 pm
Hullo.
I accept a problem while importing CSV file from Scopus VOSviewer. The error is: Incorrect Number of Columns.Reply
- Ludo Waltman February 23rd, 2022 6:52 pm
Unfortunately, due to bugs on the Scopus side, CSV files exported from Scopus sometimes crusade difficulties. In that location is no easy way to solve this problem, but it may help to include only the most essential fields in the data that you consign from Scopus, and to leave out other fields.
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- Viva Feb 22nd, 2022 iv:55 pm
Hullo,
Is it possible to conduct literature review using this tool?
Cheers.Reply
- viva Feb 22nd, 2022 4:57 pm
or is it more than nearly noesis mapping?
P.S. my commencement comment was non published in fullReply
- Ludo Waltman February 22nd, 2022 5:53 pm
A citation-based map of individual manufactures might exist useful to support literature reviewing, just VOSviewer was not adult for this purpose. Yous may want to take a look at Aaron Tay's blog (http://musingsaboutlibrarianship.blogspot.com/) for information well-nigh other tools that can be used to support literature reviewing.
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- Viva February 22nd, 2022 viii:12 pm
Thank you, Ludo.
I appreciate y'all answer.Reply
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- Amrutha February 22nd, 2022 8:08 am
Hello,
I am unable to practice co-occurrence in vos viewer installed in organisation. It is showing only bibilographi coupling ,co-citation etc but information technology is not showing co -occurrence.That is, at that place is no pick for co-occurrence but I want to practice occurrence .Is in that location whatsoever style to exercise co-occurrence.delight assist
Thank youAnswer
- Ludo Waltman February 22nd, 2022 9:10 am
In the 'Create Map' wizard, consider using the choice 'Create a map based on text data' instead of 'Create a map based on bibliographic data'.
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- Jaymes Rombaoa February 20th, 2022 nine:09 pm
Hello there!
I'm trying to import about 36,000 Web of Science records (over 70 .txt files) for a bibliographic coupling project.
I currently get the "Out of memory. VOSviewer will be terminated. Please refer to the VOSviewer manual to increases the availability of memory."
I'm currently on VOsviewer version i.half-dozen.18; I'm also using a MacBook Pro 2020 (MacOS Monterey) with Retention = 8 GB.
I consulted the Manual, but I'yard non entirely sure on the steps or what exactly to do to increase the availability of retention. Also I'm not sure on how to run the VOSviewer from the command line and enter those commands.
Whatsoever assistance or stride-by-step guide would be then appreciated!
With gratitude,
Jaymes
Answer
- Ludo Waltman February 21st, 2022 10:nineteen pm
In the Most dialog box in VOSviewer, you can come across the corporeality of memory to which VOSviewer has access. If VOSviewer already has admission to nearly memory in your computer, it won't be possible to increase the amount of retentivity that VOSviewer can use. Otherwise y'all could indeed follow the steps discussed in the manual to increase the corporeality of memory that tin be used by VOSviewer. However, I am afraid I cannot offer further assistance with this. My communication is to enquire for aid from a local ICT expert who knows how to work with the command line.
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- Beatriz Murer February 20th, 2022 viii:35 pm
Howdy,
I promise this message finds you well. Cheers for the software development. It is very helpful!
I would similar to check three information:
(I) Is there a default clustering algorithm? I enquire this because I am generating a VOSViewer network view from the Bibliometrix R package and no matter which algorithm I use in the R networkPlot role, the same network (with the same clusters) is generated in VOSViewer (when the clusterization should be different depending on the algorithm entered);
(2) Is there a maximum amount of nodes entered in a network view in VOSViewer? I ask this because when I endeavour to open up a large network (more than than 50000 nodes) in VOSViewer from the Bibliometrix R bundle using the "net2VOSviewer" role (https://github.com/massimoaria/bibliometrix/hulk/primary/R/net2VOSviewer.R), I get the error: "Error reading Pajek network file: Incorrect utilize of quotes". And the mistake does non appear when the amount of nodes is smaller;
(Iii) Is the maximum view of the links (connection between nodes) actually 10000? Because I have a network with more than 300000 links, and it would be very useful to come across all their connections in VOSViewer.
Cheers very much.
Best regards,Reply
- Ludo Waltman February 21st, 2022 nine:35 pm
VOSviewer is non intended for visualizing very large networks. Other tools, such as Gephi, are more suitable for this. We recommend to have at most 10000 items in your network. Your network may consists of more than 10000 links between items, but the maximum number of links that can be visualized by VOSviewer is 10000. I am agape I don't understand your first question. The VOSviewer manual provides some information virtually the clustering technique used by VOSviewer, including a link to the relevant research papers.
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- Beatriz Murer Feb 22nd, 2022 ane:36 am
Thank you very much for your quick reply, Ludo!
In my first question I was referring to clustering algorithms such equally "optimal","edge betweenness", "louvain", "infomap", "walktrap", "spinglass", "leading eigen", etc - which indicates the type of cluster (agregation between the publications).
I haven't found this specification explicitly at VOSviewer manual, which is why I asked here. What I did find was the indication of using an "optimization algorithm" and the linked research papers - which indicate the Newman algorithm. So I'm still not certain if VOSviewer uses the optimal algorithm, Newman'due south algorithm, or any other. I'm pitiful if it'south still unclear. Once once more, thank you!Reply
- Ludo Waltman Feb 22nd, 2022 7:25 am
The clustering technique used by VOSviewer is documented in the following paper: https://doi.org/10.1016/j.joi.2010.07.002 (preprint: https://arxiv.org/abs/1006.1032). To optimize the quality function of this clustering technique, VOSviewer uses the Leiden algorithm, documented in the following paper: https://doi.org/x.1038/s41598-019-41695-z.
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- Vivi February 20th, 2022 5:thirteen pm
Hi Ludo, one more doubt delight :)
In society to choose the best clusters agroupation for co-occurrence Keywords, the words included in a Density Visualization hot betoken, should be about the same than cluster agroupation? Or is not something which I have to reffered to. I read papers that show the simmilarities between both maps and others which analysed both maps separatly. Thank you so much!Respond
- Ludo Waltman February 21st, 2022 9:24 pm
I am not sure whether I empathise you correctly, but choices regarding the clustering of keywords shouldn't depend on what is shown in the density visualization. These 2 things accept nothing to practise with each other.
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- Vivi February 22nd, 2022 1:34 am
Thanks Ludo!
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- Varun Chandra Feb 17th, 2022 eleven:29 pm
Hi Ludo. What does a bibliographic coupling past state map represent? What practice the links between the land nodes represent?
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- Ludo Waltman February 18th, 2022 8:25 am
The links represent publications from different countries citing the same earlier piece of work.
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- Varun Chandra February 25th, 2022 1:21 am
Ok, thanks. I too noticed in the left sidebar that under the "items" tab, in that location is a list of all countries involved, and if I click on one, it will show the number of documents at the bottom, forth with link force, and number of links. What does this number of documents represent? Is it the number of documents originating from that state?
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- Ludo Waltman February 25th, 2022 8:02 am
Yeah, it is.
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- Joseph February 15th, 2022 one:45 pm
How-do-you-do Ludo, one more question please! I created a map based on bibliographic coupling/co-occurrence/all keywords and full counting. Could you please explain based on what the clusters are formed? I have a word with occurrence only 3 and total link force of 34 and it�due south in cluster ane.
Thanks heaps!Reply
- Ludo Waltman February 16th, 2022 8:48 pm
I'm afraid I don't fully understand your question. Creating a map of keywords based on bibliographic coupling is not possible in VOSviewer.
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- Joseph Feb 17th, 2022 5:14 am
Hi Ludo
Hither are the steps that I chose to create the map:
1-Create a map based on bibliographic information
ii-read data from bibliographic database files
3-upload Scopus CSV file in the correct section
iv-chose co-occurrence / unit of analysis: all keywords / counting model: full counting
5-occurrence of keyword adjusted to 3
vi- and so clicked adjacent and finished
My question is related to the clusters obtained after following the to a higher place steps. Based on what are these words distributed to the relevant clusters?
Thanks and sorry for the confusion!Reply
- Ludo Waltman Feb 18th, 2022 8:30 am
Thanks for the description, Joseph. Clusters represent groups of keywords that are relatively strongly continued to each other based on co-occurrence links, or in other words, groups of keywords that occur together in the same documents relatively often.
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- Gabriel Oliveira February 14th, 2022 11:41 pm
Boa noite, eu tive um problema enquanto tentava carregar um arquivo .txt que exportei da Web of Science, contudo, o programa apenas me mostra uma mensagem de erro de que arquivo � inv�lido devido a um problema due north�o especificado na primeira linha.
E due north�o, o arquivo .txt northward�o foi editado antes de inseri-lo no programa.
Como european union posso resolver esse problema?Reply
- Viviana Feb 14th, 2022 12:09 pm
Hi Ludo, hope you are ok! Perchance information technology's an ovbious question, sorry for that. In regarding KW co-ocurrence, I accept some difference between cluster agroupation and density visualization hot points, are supposed to prove the aforementioned groups of words? I imagine that should be simmilar since both are indicating an association betwixt KW, is that correct?
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- Ken Mwathe February 12th, 2022 11:17 am
I want to analyse national policy documents to make up one's mind the extent to which they back up biodiversity conservation in agronomics in Kenya. Does Vosviewer support using PDF databases of national and canton regime policies, strategies and plans?
Thanks, KenReply
- Ludo Waltman February 12th, 2022 3:47 pm
No, I'm agape this is not supported.
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- Joseph Guirguis Feb 10th, 2022 12:01 am
Hi squad,
Is at that place a fashion to export clusters subsequently bibliometric analysis to an excel sheet? Cheers for your help and dandy task on designing Vosviewer!Respond
- Ludo Waltman February tenth, 2022 seven:29 am
Yes, yous can save your map in a VOSviewer map file and open this file in a spreadsheet programme such every bit MS Excel. Cluster information can be found in the 'cluster' column.
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- Joseph February 10th, 2022 7:37 am
Amazing! Thanks squad for your prompt response.
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- Mahdi Zeynali February 9th, 2022 2:12 pm
Dear Nees January and Ludo
Capeesh you lot very much for advisedly designing the necessary VOSviewer software. This used software was designed user-friendly and usability way. I watched some published videos and read some manufactures and volume chapters about that. In this mode, I sufficiently learned key application of it.
All the best, Mahdi.Reply
- Vivi February ninth, 2022 11:20 am
Proficient morning Ludo, hope you are ok! I wonder if information technology is possible to make an overlapping map comparing countries keywords. In this example, there is whatsoever document which explain how to do it? Thanks!
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- Ludo Waltman February 10th, 2022 viii:37 am
Do you hateful you lot want to create a keyword co-occurrence network (or perhaps a network of co-occurrences of terms extracted from titles and abstruse) and bear witness a so-called overlay visualization in which colors are used to highlight the focal topics of different countries?
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- Vivi February 10th, 2022 9:05 am
Cheers Ludo for your reply.
Exactly! I want to create a keyword co-occurrence network and show an overlay visualization and highlight the focal topics of unlike countries. Is that possible? In this case, there is any document I could read to understand how to exercise it?Answer
- Ludo Waltman February 11th, 2022 5:52 pm
For keyword co-occurrence maps there is no piece of cake style to do this, but for co-occurrence maps of terms extracted from titles and abstracts this is possible. You can and then make use of corpus and scores files. If yous're interested, feel free to contact me by email. I tin then give a bit more than data.
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- James Phillips Feb eighth, 2022 11:xiv pm
Ludo:
The innovative work of your squad might attract resource from the philanthropic arm of Google: "The Google Foundation." The bug that you lot note in your response to my query about Google Scholar might be solvable if you had resources to interact with Google itself. The humanitarian value of VOS-Viewer is amply demonstrated by publications that have used your tool for health enquiry. Jim PhillipsReply
- James Phillips February 7th, 2022 4:56 am
A mutual challenge that I face is not with the use of VOS-Viewer, simply rather with the preparation of data for input to your software. The data annal SCOPUS has the advantage of representing commendation key words that are man reviewed. And, SCOPUS output is VOS compatible. Just, the coverage of SCOPUS tin be incomplete. I would like to work with Google Scholar which has massive coverage. Unfortunately, accessing and using Google Scholar output is problematic autonomously from its immediate brandish of individual citations. At that place is no feasible ways of utilizing Google Scholar search display output as VOS Viewer input. Right? Exercise y'all take spider web searching and data compilation tools advice to impart?
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- Ludo Waltman February 7th, 2022 9:20 am
Indeed the use of Google Scholar information in VOSviewer is almost impossible. It is very difficult to extract pregnant amounts of data from Google Scholar. VOSviewer used to provide support for working with Microsoft Bookish data, which could serve every bit an alternative to Google Scholar. Nevertheless, Microsoft Academic was discontinued at the end of final year. The most contempo version of VOSviewer offers support for OpenAlex, a successor of Microsoft Academic. VOSviewer enables users to query OpenAlex through its API. However, this functionality is withal in an early stage of development, so the possibilities are limited. Dimensions might exist another culling to Scopus. VOSviewer offers quite extensive support for working with Dimensions information, similar to what we offering for Scopus.
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- Eka Hartomy February 2nd, 2022 one:34 pm
Excuse me, I have a question
I want to exercise co-occurence analysis in VOSViewer, just I tin can't choose the selection. How do I solve this problem?
Thank you lotAnswer
- Ludo Waltman Feb 2nd, 2022 seven:25 pm
If you lot want to do a co-occurrence assay of terms extracted from titles and abstracts of publications, make sure to choose the option 'Create a map based on text information' instead of 'Create a map based on bibliographic data'. If yous desire to do a co-occurrence analysis of the keywords of publications, the availability of this choice depends on the data source you lot are using. Some data sources support this option, while others practise non.
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- Eka Hartomy February 3rd, 2022 11:15 am
In my case, I exported .ris and.csv files from dimensions.ai.
Do you know what the problem is?Reply
- Ludo Waltman February 5th, 2022 6:28 pm
Dimensions has a special export feature for VOSviewer. Make sure to use this feature. Don't use the RIS format. Dimensions doesn't accept keywords for publications, so Dimensions data cannot exist used to create a co-occurrence map of keywords. You can use Dimensions data to create a co-occurrence map of terms extracted from titles and abstracts of publications.
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- Eka Hartomy Feb 6th, 2022 11:23 pm
It worked! Give thanks you very much Ludo, hopefully we can discuss some other research-related topics over again
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- Viviana Feb 2nd, 2022 7:47 pm
Hi Ludo, cheers and then much for you standing help! Relates to this question I have a doubt which I couldn't find or totally understand from the manual. A higher resolution number means more specidicy? I tried many different combinations of resolution number, min cluster �tems, likewise as co-ocurrence umbral for keywords. Finally I got to a result which convince me, merely I accept above doubt since with unlike number of resolution (3 and five) and the same min cluster �tems (6), I got to the same number of cluster which has different word compossition. Then, I'm not sure which I have to choose, both has sence. I wonder if (for this instance) 5 means more specificity than iii. Than yous ane once more for your help and disign this favulouse tool.
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- Ludo Waltman February 2nd, 2022 7:55 pm
It'south a fleck hard for me to answer your question without seeing the actual results you get. Moreover, I'm not sure what you mean by the values of 3 and five. Are these values of the resolution parameter? Such values are rather high. Normally the value of the resolution parameter shouldn't exist higher than ii.
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- Viviana February 2nd, 2022 8:17 pm
Oh really!? I tried many diferent ones every bit the manual suggested "We recommend to try out different values for the Resolution parameter and to use the value that yields the most appropriate level of detail for one�south
purposes." And so, as I understand now is better yo use the default resolution number? (1). Thank you practise much!Reply
- Ludo Waltman February 2nd, 2022 11:45 pm
I don't recommend to just utilize the default value of one. I believe trying out different values is important. Values to a higher place 2 are uncommon, merely as already mentioned, it'due south difficult for me to annotate on your results without actually seeing them.
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- Viviana February tertiary, 2022 four:12 am
Thank you lot Ludo!
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- Viviana February 3rd, 2022 12:45 pm
Adieu Ludo, could y'all please confirm to me if there is an "upper limit number" for min items cluster? On other hand, in your answer to Eka, you mention that "If y'all want to do a co-occurrence analysis of the keywords of publications, the availability of this selection depends on the information source yous are using. Some data sources support this option, while others practice not." I constructed my information base of operations with different data sources, and I remember it'southward working well, in that location is something which I have to look to detect that something is not working so well? Thank you so much and lamentable for bother you lot!
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- Ludo Waltman February 5th, 2022 6:33 pm
Not sure if I fully understand your question, simply in principle there is no upper limit.
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- James F. Phillips January 28th, 2022 five:05 pm
Bibliometric assay tin can utilise visualization methods that are analogous to main components assay of central word association. In this approach, the user seeks to gauge factors that define master domains of association and then position articles in quadrants defined by the two principal orthogonal components. The relative concentration of articles that are positioned permits visualization of association. This is helpful in distinguishing associations that are cross-cut versus articles that business organisation themes that are focused inside an estimated domain. And, shapes of visualized clusters vary, depending upon the relationship of clusters to master components. Fourth dimension of publication tin can exist visualized, permitting the user to report trends in ideational associations. Tin can VOSViewer be used for trend analysis or interpretive analysis that the PCA approach facilitates?
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- Ludo Waltman January 31st, 2022 8:57 am
Yes, VOSviewer can exist used for this. Similar PCA, VOSviewer visualizations aim to place the cardinal patterns in a high-dimensional information set up by presenting the data in a low-dimensional space. The differences between PCA and VOSviewer are similar to those between PCA and multi-dimensional scaling. While these approaches all present high-dimensional data in a depression-dimensional space, the interpretation of the depression-dimensional space is somewhat different in the different approaches.
For trend analyses, VOSviewer offers overlay visualizations, enabling time trends to be visualized using colors.Answer
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- Vasiliki Vougeleka January 6th, 2022 ix:54 am
Thank you lot very much for this wonderful tool!
I performed a country analysis for a peer-reviewed publication and the reviewer asked me to capitalize the countries' names. Can this be done? If not, is it somewhere written in the manual or the website to show it to him?
Thank you!
.Reply
- Ludo Waltman Jan sixth, 2022 12:22 pm
You can save your map in a VOSviewer map file, open this file in a spreadsheet program such as MS Excel, and then capitalize the country names. The country names tin be found in a column with the header 'characterization'.
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- Vasiliki Vougeleka January 6th, 2022 12:32 pm
Thanks for your reply and your aid!
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- daniz March 4th, 2022 11:49 pm
How-do-you-do there,
Could you lot delight explain more in particular? I have the same effect but could not solve it.Answer
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- Josie Slaathaug Jan 5th, 2022 8:02 pm
Hello, I have two questions!
Is in that location a publication likewise the manual that provides a concise summary of what relevance scores are based on for creating a keyword co-occurrence map?
I'chiliad trying to decide whether creating a bibliographic or text map better suits the keyword co-occurrences, and am wondering how those make up one's mind keywords differently? Using the aforementioned datafile, the methods vary by about 200 keywords and vary widely in the number of terms that meet the minimum threshold. Wondering how the methods differ.
Thank you,
JosieAnswer
- Ludo Waltman January 5th, 2022 10:58 pm
Maps of keywords don't utilize relevance scores. Maps of terms extracted from titles and abstracts practice use such scores. Unfortunately, we don't have a full documentation of the algorithm used for calculating the relevance scores. The best documentation we have can exist found in the post-obit short paper: https://arxiv.org/abs/1109.2058.
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- Albina Krymskaya Jan 3rd, 2022 7:29 pm
Hi, I accept a question on harmonization of journals titles in CVC file from Scopus. If I normalize the titles, my file tin can't be read by VOSviewer. Would you please help to solve this problem? Thank you!
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- Ludo Waltman January 3rd, 2022 11:19 pm
My advice is not to make any changes in CSV files exported from Scopus. This usually causes issues. Instead, you can create a so-called thesaurus file to harmonize journal titles. Encounter the VOSviewer manual for more than information about thesaurus files.
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- Albina Krymskaya January fifth, 2022 5:47 pm
Thank you! It worked. I created a thesaurus file.
Simply now at that place is another problem - when I create co-authorship - countries several affiliation is incorrect in Scopus so CSV file has wrong information. I compared affiliation information with the newspaper and check amalgamation.
Example - Scopus gives 17 documents for Autralia, but the right number is 18; 108 for USA, simply the right number is 107. A cited document for Australia give USA past fault. So my question is what should I practice in this situation? I guess a thesaurus file won't help in this case. If I leave it as information technology is then I will nowadays incorrect information which is not good for a inquiry paper.
Could you please help with this?
Thanks!Reply
- Ludo Waltman January 5th, 2022 11:15 pm
That's an interesting question. Your VOSviewer map volition give an authentic representation of the information provided by the Scopus database, but indeed it may not give an authentic representation of the information independent in the actual underlying research articles. I recall it is important to make the distinction between these 2 types of accuracy.
If your VOSviewer map doesn't give a fully accurate representation of the information independent in the research manufactures, I believe this is a limitation that you need to acknowledge in whatever paper or report in which you lot present the VOSviewer map. Still, small-scale inaccuracies won't fundamentally affect your conclusions, and having such inaccuracies is almost inevitable in whatever data analysis of significant size, so in my view this doesn't invalidate your piece of work.Reply
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- Sefika Jan tertiary, 2022 3:53 pm
I ran the command prompt but when I enter coffee �Xmx4000m -jar VOSviewer.jar
I get an error message 'unable to admission jar file VOSviewer.jar I accept the latest version of Java, but I still go the same fault message.Respond
- PhD Melike January third, 2022 2:40 pm
Dear respected Prof Ludo,
I'm trying to analyse citations and years based on the data gathered from WOS (txt file), past VOSviewer.
I selected" to create a map based on bibliographic information" in the next phase, I selected "read information from bibliographic database files".
However, I can't choose citation etc. I tin can only choose co-authorship (I mean it's non optional). That'southward why I can't proceed my analysis.
Tin you lot assistance me please to resolve my problem about mapping citations and other options.
Kind regards,
PhD MelikeReply
- Ludo Waltman January 3rd, 2022 iii:36 pm
When exporting information from Web of Science, information technology is of import to cull the option 'Full Record and Cited References'. If cited references are not included in the data exported from Web of Science, VOSviewer won't be able to create a citation-based map.
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- Mell January second, 2022 12:25 pm
Howdy love respected researchers,
Although I watched videos near VOSViewer, I could't manage to upload data from Web of Science to VosViewer software. Maybe information technology's so bones outcome, but unfortunately I'1000 stuck here. Can you assistance me delight?
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- Albina Krymskaya January 16th, 2022 9:54 pm
Hi, if information technology is all the same interesting to yous...
You should bank check your language. When y'all exporting data from Web of Science you lot need to switch to English. I had a like problem and could not understand why I could non upload to VOSViewer.Reply
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- Catherine December 30th, 2021 4:23 pm
Hello, over again.
I've generated co-authorship maps for authors, organizations, and countries. I've cleaned the affiliation column so that the format is "organization proper name, country; organization name, state". Notwithstanding, while my authors and countries maps are showing both nodes and lines, my organizations map is just showing nodes. Have I missed something?
Cheers.Answer
- Catherine Jan 5th, 2022 ix:46 pm
Hello,
I eventually realized that the lines weren't showing considering there weren't enough links between the nodes. Yet, if I opted to only view the nodes with the links, the lines practise appear.Reply
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- Sefika December 29th, 2021 10:09 pm
I ran the command prompt but when I enter java �Xmx4000m -jar VOSviewer.jar
I get an error message 'unable to access jar file VOSviewer.jar I have the latest version of Java, simply I all the same get the same error message.Reply
- Sefika December 29th, 2021 9:04 pm
I am having the not plenty memory error message. I read the manual but could not effigy out where the control line is or how I can run the jar file. Could you delight aid? Cheers.
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- Hilda December 27th, 2021 4:58 am
After I initially commented I appear to have clicked on the -Notify
me when new comments are added- checkbox and from now
on each time a comment is added I get 4 emails with the same comment.
There has to be an easy method you tin can remove
me from that service? Many thanks!
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- Ludo Waltman Dec 30th, 2021 3:thirteen pm
The emails sent to yous should include an selection to unsubscribe. Did you try this?
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- Sona Fathi Dec 26th, 2021 4:35 pm
Hi, and I thank you for your useful software. How tin can I see just ane cluster in the screen?
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- Ludo Waltman December 26th, 2021 6:44 pm
I am afraid there is no easy way to reach this. You need to save your map in a VOSviewer map file, open this file in a spreadsheet program such as MS Excel, and delete all lines corresponding to items that practice not belong to the cluster that y'all are interested in.
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- Kumudu December 24th, 2021 ix:51 pm
Hello Nees and Ludo,
Thank you for this wonderful tool. I was looking if this folio has a proper citation link and couldn't find it. Would you kindly share if you have a link to cite VOSviewer?
Regards.Reply
- Ludo Waltman Dec 25th, 2021 eight:07 am
Thanks for asking. Nearly VOSviewer users cite the post-obit paper: https://doi.org/x.1007/s11192-009-0146-3. This is the paper in which the VOSviewer software was originally introduced.
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- Kumudu December 25th, 2021 9:22 pm
Thanks, Ludo.
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- Viviana December 22nd, 2021 11:23 am
Hello! Kickoff of all I would like to congratulate yous for the tool and besides cheers so much for letting u.s. use it!. The programme works very well with the database I constructed to my master study. I would like to know if is it possible to take off some labels, in order to highlight the most important ones.
Thanks in advance!Reply
- Ludo Waltman December 22nd, 2021 6:29 pm
Yeah, this can be washed past saving your map in a VOSviewer map file, opening the map file in a spreadsheet program such as MS Excel, and deleting the labels (in the 'label' column) that you want to get rid of. When you then open your map in VOSviewer, the labels that have been deleted will no longer exist visible, and this provides more space for showing the labels of other items in your map.
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- Carlos December 20th, 2021 8:fifty pm
I am trying to run it on Linux - OpenJDK 1.viii.0_312. I meet the screen of the application after the splash screen, merely I cannot collaborate with the window. I can only close it. Any idea?
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- fabio freitas da silva Dec 10th, 2021 6:32 pm
politician�ticas p�blicas
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- ANTONIO CARLOS FREIRE ROBOREDO December 10th, 2021 6:39 pm
quero rede bibliom�trica
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- Jackie Greatorex December 7th, 2021 3:21 pm
HI
does this piece of work in a linguistic communication other than English?
CheersReply
Source: https://www.vosviewer.com/getting-started
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