Getting Started

Dear Ludo, in bibliographic coupling (of documents, mainly) is there a way to determine the optimal number of clusters in which to classify objects? I have seen empirically that once the min cluster size has been established, by increasing resolution the number of clusters quickly stabilizes. Does this seem like a correct mode to you? I generally place the min cluster size between 30 and 40 documents (in collections between 1000-3000 documents) in order to have enough documents for any subsequent applications, for example keyword co-occurrence. I hope you are well and preparing another one of your precious packages.

How to cite VOSviewer in our papers?

I am trying to use VOS viewer generate a map from lines of comma-separated keywords that exists as a standalone CSV file. Is there a way to import this file?

I'm starting to use vosviewer for my research, this tutorial helped me a lot about how to use correctly this tool. Thanks very much

I am scholar and researcher.

I m getting an error in vos viewer line 8 has incorrect no of columns what to do?

Hello, working with VOSviewer version 1.6.19 and trying to query Crossref (DOI, ISSN...) I get an error message: Error downloading cross reference data. Connection problem. I have checked my internet connection and it is fine. Any suggestion?

Hi,
I am new to VOS and I have a few questions!
Is it possible to to e.g remove items (terms) after a map has been generated?
How does one merge terms to one (e.g. a term and its abbreviation)?
/Bethanie

Dear Prof van Eck and Prof Waltman,
I'm consulting the bibliography on data normalization methods in vosviewer, according to the literature indicated in the manual ( VOSviewer version 1.6.19, p. 22). However, I was unable to satisfactorily interpret the differences between equations 6 (association) and 13 (fractionation). Mainly the option in the analysis table "fractionalization" to visualize items and/or clusters. Thank you very much.

Hello, how could ı merge scopus and WoS data and run on vosviewer.

Hi. I would like to ask, when I generate the co-authorship visualisation map between countries, there are few dots that do not have any country name. May I know why is that? I set the minimum document of a country is 3.
Thank you very much

Is the following description of total link strength in keyword co-occurrence analysis correct?
"Total link strength is a metric that captures the number of other keywords with which the specified keyword co-occurred (i.e., was linked) in the review database.
Thanks.
Philip

I tried to upload the 1st 2000 results and have not open or change the file, but VOSviewer shows an error "IOException line 1199 invalid char between encapsulated token and delimiter". Does somebody know what does it mean?

Agradeço pelo VOSviewer.

Thanks for VOSviewer. Can you please explain how total link strength is calculated so I can interpret what it means. I’d like to use it in a term cooccurrence analysis. For example I have a term with 24 binary occurrences and a TLS of 71. Thanks Peter

Thankyou for VOSviewer. Can you please explain how total link strength is calculated. I’d like to use it for a term concurrence analysis but am unclear beyond the general description in the manual how to interpret the numbers. For example if have a word with 24 binary cooccurrences and a total link strength of 71?

I am using VOSviewer 1.6.18 version and till few days back everything was working fine but then suddenly, I am not able to save any of the maps generated to my system. As soon as I save or copy to clipboard, the application stops responding and keeps hanging until I have to force quit it. So basically, whatever results I am generating through VOSviewer, I am not able to save or export them. I have tried re-installing app multiple times, having cleared cached files and restarting the system.
I am using MacBook Air, iOS (Big Sur, 11.2). Any help on this would be greatly appreciated.

Hi Ludo
Two questions.
1. Is there any viable method of disambiguating Chinese author names such as "wang, y." when it refers to multiple authors and there is no alternate form (e.g., wang, y. and wang y.y.)?
2. On co-citation and keyword maps, what accounts for the situation when two authors/keywords with many links but are located far apart on a map?
Thanks.

Hi
I m using Vosviewer 1.6.18, it's an amazing tool, however with this new version we don't have the ability to use the keyword analysis does not exist, there are only 4 type of analysis: Co-Authorship, Citation, Bibliographic coupling and co-citation we no longer have the possibility to choose Co-Occurrence.
Any Idea on how to overcome this issue
Thanks

How does VOSviewer calculate the average publication year？

Dear Prof van Eck and Prof Waltman,
In a term co-occurrence map, is it possible to see which specific journal articles a term shown in the map is linked to?
Thank you so much,
Julian

Hi,
There is an error when I want to use the thesaurus file!
It says, "error while reading VOSreviewer thesaurus file (line1), incorrect use of quotes.
Thanks, Mohammad

I solved it, select all options not the default when you do csv export from Scopus
https://www.youtube.com/watch?v=azw1EEZrNI8

Hi. I have a text of keywords/topics that I would like to analyse and map using the VosViewer. The topics are in the format below. When I try to analyse them, VosViewer maps words instead of a topic/phrase. I have tried to separate the words using a semi-colon but in vain. The file format is .txt.
HIV,HIV Infections,HIV-1
Health Literacy,Patients,Internet
Traffic Control,Transportation,Models
Industry,Research,Marketing
Archives,Library,Collections
Semantics,Models,Recommender Systems
Agents,Game Theory,Models
Electricity,Energy,Economics
Electronic Health Records,Medical Informatics,Delivery Of Health Care
Library,Librarian,Information
Library,Librarian,Information
Archives,Library,Collections
Library,Librarian,Information
Industry,Information Systems,Research
Microfinance,Farmers,Cooperative
Library,Librarian,Information
Computer Crime,Network Security,Intrusion Detection
Knowledge Management,Industry,Research
Microfinance,Farmers,Cooperative
Neutropenia,Granulocyte Colony-Stimulating Factor,Neutrophils

Hello, what is the difference between the keywords analysis in "bibliographic data" and the terms of Title and abstract fields in ”text data“?
In what situation will you record each of the methods？
thank you！

Hello Prof Waltman,
I would be extremely grateful if you could help me with the following issue:
I exported data from Scopus by checking all the boxes for a CSV file. When I open the file in VOSviewer, however, it only displays the Co-authorship and Co-occurrence options. There is no citation, bibliographic coupling, or co-citation.
Your response is highly valued.

Hello,
I created a thesaurus file to replace common names with species names, and I'm having trouble getting vosviewer to read it properly. Keywords of common names are still appearing when it should be only cleaned up species names. Does anyone have advice on how to get this file to work? I simply made a two-column excel sheet and exported as a tab-delimited .txt file.
Quick help would be much appreciated!

Hello Prof Waltman,
I would be extremely grateful if you could help me with the following issue:
I exported data from Scopus by checking all the boxes for a CSV file. When I open the file in VOSviewer, however, it only displays the Co-authorship and Co-occurrence options. There is no citation, bibliographic coupling, or co-citation.
Your response is highly valued.

The txt or ris file extracted from WoS is not working for this version of VOSviewer(can't analysis co-occurrence or so), please fix this problem :(

How do we fix the import errors from EndNote X9 file to VOSviewer?
can not find author %A or keyword %K field

Hello, I made a variety of maps yesterday and hosted them on a website through Google Drive links. The embedded maps are now all broken. When I make a new map and try to share the link through google drive, the maps do not work and I get an error that the JSON files cannot be found (even though I went through authentication). Everything was working perfectly and then stopped.

Please help!
I exported data from Scopus and ticked all the boxes to have a CSV file. However, when I import the file in VOSviewer, it only shows Co-authorship and Co-occurnance options. Citation, bibliographic coupling and co-cotation are not active.

hi
can we use co-citation analysis?
currently, it is unavailable as we cannot select or click.
it is in gray color.
Thanks!

Is it possible to use Arabic language in this software?.
Thaks

I teach my student to use VOSviewer in Ukraine. Thanks!

Hi,
I am having problem with key word mapping. Everytime it is showing error. And now even the other functions other than co authors is nor working.

Dear Ludo,
Could you please explain a bit more about the algorithm for calculating the relevance scores? I read from previous answers that there is no documentation, but I'd like to understand better the criteria to assign this score. Essentially, if I choose to keep the 60% (or similar) of terms, it always disregards terms that are very relevant to me, such as some terms from my query.
Conversely, if I use 100% of the terms, I need to use a long list of terms in the thesaurus file or manually unselect them, otherwise, the map is full of meaningless terms.
I appreciate any feedback!
Kind regards,

Hello Prof Waltman,
I would be really grateful if you could help me with the following queries
1) What does size of the circle on the network visualization map represents?
2)Does the meaning of size of the circles shown on the network visualization map differs in the case of bibliographic coupling and co-citation analysis?
2) what exactly does total link strength means in case of analysis of articles?
4) In some cases, some items of one cluster are seen in another cluster, could u please tell what does it represent?

Hi there,
Excellent job. Thank you.
I have a question concerning the word "leafe" appearing in my charts. "Leaves" is a common word in my input file that doesn't appears in the chart. leafe is spacially close to leaf.
Could you help
Best regards
Abraham

Hello!
Why you remove the questions were asked before 2022? I refer to them to find my problems. this causes Repetitive question.
if it is possible email me the previous them. And I have the Repetitive question:
how can I have screenshots of each cluster separately?

Hello!
I have a question regarding the overlay visualization using the average publication year. I have publications dating from 1999 to 2022, but when I do the overlay visualization it automatically chooses a scale from 2016.5 to 2018. Ofc this is related to the fact that the number of publications in my database, increases for the latest years. I know you have an option of normalizing the years to -1 to 1, but this does not provide enough insights regarding the evolution of research over years. Have you considered adding another normalization/scale to this visualization?
Thanks!

Good to get familiar with Vos viewer

Hello, again.
I've been using thesaurus files containing labels that are not replaced by anything (so the labels are excluded) and labels that are replaced with other terms (for example, key enabling technology would be replaced by technology). I noticed that this results in substantially different identified noun phrases than if I were to not use a thesaurus file. In this case, is it recommended to use a thesaurus file with the way that I've been using it (is this making VOSviewer more effective in identifying relevant noun phrases?), or is it best to use it sparingly and only to replace words with another term?
Thank you.

Hello,
In the Van Eck and Waltman (2011) paper, what does "distributon of (second-order) co-occurrences mean? Also, what would be the cut-off score between high and low relevance scores? For example, if I have relevance scores between 0.01 and 2.16, would high relevance scores be those above 1.00?
Thank you.

Hi,
i have two queries:
1) Why vos viewer doesn't show all the labels on the map? Is there a way to deal with this?
2) How does vos viewer identifies countries of the publications? Is it the country where the authors belong? or is it the country where the article is published?
3) Does vos viewer allows us to remove the logo of vos viewer from the visualization map?
I would be grateful if someone could help with this.

why don't you answer me????????????????

there are difficulties in sharing some of the maps, and I can't understand why it share one and not the other....
for exam:
https://tinyurl.com/y3faey3g- the link can be shared.
https://tinyurl.com/yxq6xl63- the link can't be shared!
I'll appreciate any clarification...

Hello. I am following up on my questions: 1) While "and" is not included in the noun phrases, "&" is included. I'm wondering why that may be? 2) I was trying to send a previous message several times as it kept saying the verification expired until I got a message saying that my IP was banned due to suspicious activity. I couldn't access the website after that. I am now on a different IP and when I went to this webpage, I saw that my message had already gone through. Is there a way to clear the ban? 3) Just a note that it doesn't seem like all plural noun phrases are converted to singular. For example, "key enabling technologies" and "key enabling technology" are both in the "Verify selected terms" section of "Create map". 4) The “Share” icon doesn’t show up for me on VOSviewer Online. I’ve tried it on Chrome, Edge, and Firefox. Is there a reason I'm not allowed to share? 5) In the thesaurus file, what are the potential consequences, if any, if several terms, identified from different documents, are replaced by one term? For example, if the labels “co evolution” (from document 1), “evolutionary function” (from document 2), “cities evolf” (from document 2), and “long term evolution” (from document 3) are replaced by “evolution”, will VOSviewer then show “evolution” coming from 3 documents (for binary counting)? And how will this affect the relevance score and the clustering? Thank you!

Hi! I'm currently using VOSviewer in my thesis and I stumbled upon a question mark. In the analysis tab I've experimented with the clustering and I can't choose if I should change the min. cluster size or the resolution to get my desired amount of clusters (around 9, to better view and describe the clusters). I'm not sure if my desired amount of clusters is a question of detail or simplicity. Does anyone have any advice in which of these modifications are better to use?
Co-citation map based on min. cluster size (9 clusters): https://tinyurl.com/y5fjcvhr
Same map based on resolution (9 clusters): https://tinyurl.com/y6e6zdv6
There is a difference but I can't tell what the difference is or what it means, if that makes sense. Any help would be greatly appriceated!

there are difficulties in sharing some of the maps, and I can't understand why it share one and not the other....
for exam:
https://tinyurl.com/y3faey3g- the link can be shared.
https://tinyurl.com/yxq6xl63- the link can't be shared!
I'll appreciate any clarification...