Getting Started

To get started with VOSviewer, you may want to take a look at some of the sources of information listed below.

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VOSviewer manual

The VOSviewer manual provides detailed and up-to-date information on the functionality of VOSviewer. The manual can also be accessed using the Manual button in VOSviewer.

Open VOSviewer manual

 

VOSviewer book 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-step manner. 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 chapter 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 meantime, VOSviewer has been improved and extended in many ways, so the paper is not fully up-to-date anymore. However, it still provides a useful introduction into the main ideas underlying VOSviewer.

Open VOSviewer paper

AIDA bookletAIDA booklet

The AIDA booklet introduces diverse case studies on research positioning and trend identification. These case studies are relevant for PhD candidates, researchers, group leaders, and policy makers. Many of the case studies make use of VOSviewer.

Open AIDA booklet

Comments

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  • Maryam Alefpour April 21st, 2021 3:04 pm
    Hi,
    I would be appreciated if you explained how could I add year in last report.
    Thanks,
    Reply
  • Aynul April 21st, 2021 10:13 am
    Dear sir,
    I have now installed the latest version today but it is not activating following options while going for analysis:
    1. Citation
    2. Co-citation
    3. Bibliographic coupling
    Waiting for your suggestions.
    Reply
    • MD AYNUL HOQUE April 21st, 2021 6:06 pm
      Sorry, I found the solution. sorry for bothering you.
      Reply
  • Prokriti Mukherji April 21st, 2021 8:52 am
    Hi,
    I am a lecture at King’s College London and I am using Vosviwer for the first time. I am looking to map/ link who published with whom and how much- sort of network of authors, from where I coudl hopefully pull out he netwokrs of the most published authors.
    I have a file in csv format with Title of paper, and columns with Author1, Author 2etc..
    I tried uploading this file but get multiple errors the main ones:
    1. When the title of paper remains in the file it just will not take it
    Else one time it said number of columns should be greater than number of lines
    My file has 1500 rows and 10 columns – does that mean I need to create 1500 columns ( the maximum authors we have on any one paper is 10)
    2. Line 3 unique ID (line three has two authors who have collaborate don many papers)- this is the Most common error I have been getting.
    I tried putting none31 in line 2 and none32 in row 3 so that the two rows would not be exactly alike but that did not work.
    Is there a simple way to upload a such a csv and get a network of authors mapped out?
    Would appreciate any help you can provide. Happy toc all and chat or do an MS teams call.
    Thank you in advance fro your help.
    Please a snapshot of the file below - sorry the formating is not okay but it is from a csv file.

    Title Author-Name-1 Author-Name-2 Author-Name-3..
    Measuring Consumer Interactivity in Response to Campaigns Coupling Mobile and Television Media ROBERTDAVIS LASZLOSAJTOS
    Reply
    • Ludo Waltman April 21st, 2021 9:16 am
      You need to provide your data to VOSviewer in a format that can be processed by the software. The best option seems to be to provide your data to VOSviewer in a VOSviewer network file (possibly combined with a VOSviewer map file). This would mean that you need to restructure your data so that it has the appropriate format for a VOSviewer network file. Please see the VOSviewer manual for more information about this format.
      Reply
  • Philip H. April 20th, 2021 10:49 am
    Hi
    I have created many thesaurus files but am encountering a strange problem with the most recent one. The file filters correctly for all analyses EXCEPT author citation analysis. For example, when I run author co-citation analysis the author names are correctly replaced with the alternate form. Keywords and countries are also replaced correctly.
    Any idea why that would happen?
    Philip
    Reply
    • Ludo Waltman April 20th, 2021 3:17 pm
      Make sure to write author names exactly in the format used by the database that you are working with (e.g., full first names or only initials, initials with or without periods, first names before last names or first names after last names, etc.).
      Please note that, depending on the database that you are working with, co-citation analysis may use a different format for author names (i.e., the format used in the reference lists of publications).
      Reply
  • Selma April 20th, 2021 10:22 am
    Hi,
    thank you so much for offering free of charge VOS viewer, it is amazing progress compared to some other previous softwares. I kindly ask you for your help, with mapping collaborators on a geographic map (Case 21 in AIDA booklet).
    Namely, I tried to understand how to add extra nodes that represent country boarders but have not been successful. Can you please explain me how to do that and where exactly to find instruction?
    Thank you.
    Reply
    • Ludo Waltman April 20th, 2021 2:33 pm
      I am afraid that detailed instructions are not available. As an alternative, you may consider using the NETSCITY tool. See https://www.irit.fr/netscity/prod/intro/.
      Reply
  • Zheng April 18th, 2021 3:51 pm
    Hi, I want to use VOSviewer to make a term co-occurrence map, but I found that the Chinese abstracts in the RIS file I imported cannot be recognized, and only a few English words can be subsumed in it. I have not found any information about Chinese abstracts on the Internet. So I am sorry to bother you, is it because Chinese is not supported? Thank you.
    Reply
    • Ludo Waltman April 18th, 2021 4:54 pm
      VOSviewer is only able to process English-language text. You could consider creating a machine translation of your abstracts from Chinese to English, and to provide the translated abstracts as input to VOSviewer.
      Reply
      • Zheng April 19th, 2021 5:12 am
        Thank you for your reply. I will try to translate it into English for analysis. Thanks!
        Reply
  • Philip H. April 18th, 2021 11:56 am
    We created a list in Scopus and downloaded as CSV. We did not open the csv file or change it in any way.
    We opened VOSviewer and loaded the file. However, the only analysis options that appear are Co-author and Co-occurrence.
    Why would that happen?
    Reply
    • Ludo Waltman April 18th, 2021 1:08 pm
      Please see my response below to a question by Anil Kumar on April 8.
      Reply
    • Philip H. April 18th, 2021 1:46 pm
      Sorry but i don't see any posts on April 8. There is an A Kumar in March but different question. Sorry for the inconvenience.
      Philip
      Reply
      • Ludo Waltman April 18th, 2021 4:50 pm
        The question by Anil Kumar can be found using the search feature in your browser. It's a response to an earlier conversation in January.
        Reply
  • Miyuki Maezawa April 16th, 2021 6:25 am
    Hi,
    I'm trying to create a map using a CSV file which I downloaded from Scopus. But an error message "Error while reading Scopus file 'scopus.csv';-1. I tried to download and make another new file in several times. What is the meaning of "-1" in the error message ? How can I resolve this ?
    Thank you.
    Reply
  • Santiago April 16th, 2021 3:31 am
    I'm having a problem and is that when I try to put a thesaurus to mi file, I follow all the steps that the manual said, but when I'll try to put it, VOSviewer says that the header of the first line is empty, and it is not
    Reply
  • Alba April 14th, 2021 5:44 pm
    Hi!
    I'm trying to create a map from PubMed. I've exported them like file with Medline format. Once I'm trying to open them in VOSviewer it says ¡ : "Error while reading PubMed file `pmc_results.txt` (line 2530): Multiple DP fields".
    And I have no idea about what I should do. Please, could you help me?
    I've used the software in the past and I have never had this problem.
    Thanks in advance.
    Reply
  • Bin Chen April 14th, 2021 7:09 am
    Hi, I am importing a pajek .net file into VOSviewer, but it says "error: all items have same coordinates." How should I fix this?
    Reply
  • Samantha April 11th, 2021 5:20 pm
    Hello there,
    I have a meta data exported from Web of Science, I wanted to analyze author bibliographic coupling, but unfortunately, some of the authors' name have written differently and they are counted twice or more and they got different scores.
    exp: Boje, d. or Boje d. m. or Boje, dm.
    so, the result is not valid, is there any way to have more accurate result?
    Many thanks.
    Reply
    • Ludo Waltman April 11th, 2021 7:14 pm
      To correct inconsistencies in author names, my advice is to create a thesaurus file and to provide this file as input to VOSviewer. See the VOSviewer manual for more information about thesaurus files.
      Reply
  • Ma In April 5th, 2021 9:38 pm
    Dear Ness and Ludo,
    Thanks for the wonderful demonstration on the YouTube. I tried to install the VOSviewer in my mac catalina. But the VOCviewer file opens but very soon closes by itself without any warning or such thing. I downloaded the latest Java and tried to use the tutorial you have provided for MAC users. But I did not get the settings/ open any way option at all.. Please let me know how I can install the VOSviewer.
    Thanks,
    M
    Reply
  • Philip H. April 2nd, 2021 9:39 am
    I am reviewing a ms for publication and the author has applied journal co-citation
    network analysis, author co-citation network analysis, and bibliometric coupling to a database consisting of only 54 journal articles. It is my understanding from discussions on this Board that this is well below the necessary threshold for obtaining valid results through these bibliometric analyses.
    Am I correct, and are there any conditions that would make the application of these analyses to such a small viable?
    Thanks.
    Reply
    • Ludo Waltman April 2nd, 2021 10:02 am
      My view on this issue is that from a validity point of view there is no need to have a certain minimum number of articles. An analysis based on a small number of articles is not necessarily invalid. On the other hand, from a usefulness point of view, the value of an analysis based on a small number of articles may be quite limited. VOSviewer visualizations tend to be more useful when working with larger numbers of articles.
      Note also that a co-citation analysis based on a database consisting of 54 articles is likely to be more interesting than a bibliographic coupling analysis based on such a database. The bibliographic coupling analysis will be focused on the articles contained in the database, while the co-citation analysis will be focused on the references in these articles. This means that the co-citation analysis will probably cover a larger number of items (e.g., documents, authors, or journals) than the bibliographic coupling analysis.
      Reply
  • MICHAEL MCDONALD April 1st, 2021 4:09 am
    Hi,
    I have built a reference list based on a search on ProQuest, scanned / culled using Research Scanner with the selected references saved into an EndNote X9 database. I would like to use the EndNote output to run through VOSviewer. The output formats available are .txt and .enl files which I have not been able to make work. Unfortunately VOSviewer seems to be looking for .enw formats or .txt files in different formats from EndNote. Can you confirm that this is the case or point out what I am not doing correctly?
    Kind regards
    Reply
    • Ludo Waltman April 1st, 2021 10:35 am
      Unfortunately VOSviewer indeed does not support the ENL file format, but only the older ENW file format. The RIS file format may offer an alternative way to provide data as input to VOSviewer.
      Reply
      • MICHAEL MCDONALD April 2nd, 2021 8:19 am
        Hi Ludo,
        Thank you for your reply. Sorry to hear that VOSviewer does not support the newer EndNote file format. In suggesting using a RIS file format, are you suggesting that there should be a RIS file for each reference loaded into VOSviewer?
        Cheers
        Reply
        • Ludo Waltman April 2nd, 2021 9:53 am
          A single RIS file may contain data for multiple references.
          Reply
  • André March 30th, 2021 10:38 pm
    Hi
    When I select the keyword option by author, VOS generates the word map and its links and builds a cluster based on these keywords. My question is how I can identify the authors by keyword cluster. it's possible?
    Reply
    • Ludo Waltman March 30th, 2021 11:53 pm
      I'm afraid there is no easy way to do this. VOSviewer doesn't provide any functionality for this. Also, many authors probably use keywords belonging to multiple different clusters in their publications, so a simple link between authors and keyword clusters often won't exist.
      Reply
  • Niklas Schmidt March 22nd, 2021 11:38 am
    Hello,
    While working with the VOSviewer, one question occurred. Regarding the co-occurrence map, the link strength between two keywords shows the number of co-occurrences in a document. What is the interpretation of the distance between two items? It is mentioned in one of your articles that the distance depends on the similarity. What are the requirements for items to be similar?
    Thank you in advance
    Kind regards
    Reply
    • Ludo Waltman March 22nd, 2021 12:11 pm
      In the case of a co-occurrence map, the similarity of two keywords is determined by their number of co-occurrences. The larger the number of co-occurrences of two keywords, the higher the similarity of the keywords and, in general, the smaller the distance between the keywords in the map.
      Reply
  • A Kumar March 21st, 2021 7:49 pm
    Dear Developers,
    I would like to ask about creating a map of research articles connected with each other through citations. For example, if I have 100 research articles these may not be from one specific journal. What I need is that how these 100 research articles are connected with each other through citations. So, what should I do in order to get what I need. I would appreciate for any type of guidance with or without vosviewer.
    Kumar
    Reply
    • Ludo Waltman March 21st, 2021 8:58 pm
      VOSviewer enables you to create a citation network of documents and to visualize this network. This seems to be what you are looking for.
      Reply
  • Emily Nolan March 11th, 2021 11:57 am
    I downloaded data from Web of Science and I want to create a keyword map. When I selected the file I got an error message 'Error while reading Web of Science file 'xxxxxxx' (line 3): Incorrect number of columns.' Why might this be and how do I fix it?
    Thank you!
    Reply
  • Zuas March 11th, 2021 12:02 am
    Dear,
    Is it possible to combine to CSV file from two or more different source? for example one is from Scopus and another from Pro-quest? If so, how? help please so I can use both in one file for VOSviewer run? thx you
    Reply
    • Ludo Waltman March 11th, 2021 12:12 am
      I am afraid there are no easy ways to combine data from different data sources, except when the data sources support the same file format for exporting data (such as RIS).
      Reply
      • Zuas March 11th, 2021 10:55 am
        Thank you for your prompt reply. But let take an example I have 2 deferent CSV files and both are taken from SCOPUS. Please how to combine them? Thank you
        Reply
        • Ludo Waltman March 11th, 2021 10:59 am
          You actually don't need to combine them. If you have two Scopus CSV files, you can provide both of them as input to VOSviewer at the same time. VOSviewer is able to process multiple input files at the same time, provided that the files have the same format.
          Reply
          • Zuas March 12th, 2021 7:35 am
            Great Sir, thank you so much. Stay safe
            Reply
    • Anthony Macedo March 11th, 2021 9:17 am
      Echchakoui gives somes tips in "Why and how to merge Scopus and Web of Science during bibliometric analysis: the case of sales force literature from 1912 to 2019".
      Reply
  • Simon Senzon March 3rd, 2021 7:41 pm
    Greetings. I have built my own bibliometric article database with the help of a programmer. When I import an excel file with Source and Target, I run into a dilemma because some of my sources are also targets. Do you have any suggestions? Thanks.
    Simon
    Reply
    • Ludo Waltman March 3rd, 2021 10:21 pm
      VOSviewer doesn't support directed networks. Only undirected networks are supported. Hence, when there is a link between two items, it is not possible in VOSviewer to distinguish between a source item and a target item.
      Reply
      • Simon Senzon March 4th, 2021 6:03 am
        Thank you.
        Reply
  • Abdul Syahid February 25th, 2021 4:17 pm
    Thank you very much for your invaluable software. It helped me very much when I conducted a bibliometric study on a single journal.
    https://www.jlls.org/index.php/jlls/article/view/2075
    I would like to ask for your feedbacks on how I run the software and interpreted the results.
    Your feedbacks certainly improve my further bibliometric studies using your software.
    Thank you.
    Reply
  • Philip February 25th, 2021 1:52 am
    Could you please clarify this point about journal co-citation analysis. If VOSviewer shows 266 cited references of a particular source in co-citation analysis does it mean:
    a) the journal was cited 266 times by sources contained in the review database, or
    b) 266 of the sources contained in the review database cited this journal, or
    c) different interpretation?
    Thanks
    Reply
    • Ludo Waltman February 25th, 2021 7:16 pm
      I assume that you use the term 'review database' to refer to the data set that is provided as input to VOSviewer? Interpretation a then is the correct one.
      Reply
  • Joshua Pfeiffer February 22nd, 2021 9:35 pm
    Hello!
    At first, thank you so much for this great software.
    While doing a bibliographic analysis one question did arise. In the documentation of the bibliographic results I would like to implement the cluster and given keywords calculated by the VOSviewer, which are usually shown in the Action panel in the Items tab.
    Is there a possibility to save all the clusters and appropriate keywords for example in an Excel file without typing them manually down? This would be a great help to easily extract the information of the clusters and keywords.
    Thank you very much in advance!
    Best regards
    Reply
  • Leonardo P. Cassandro February 22nd, 2021 4:04 pm
    Dear Ludo,
    congratulations on implementing this software. I have only one doubt: I am carrying out a bibliographic coupling analysis but I do not understand the criterion for which papers are associated with others in different clusters. What is the relationship that associates for example two papers in a single cluster? Even comparing them one by one I can't figure out what the relationship is. is it possible to have an explanation? Thanks in advance
    Reply
  • F Ali February 17th, 2021 6:56 am
    Hi,
    We've mined Scopus data via their API (not their website manual download). Can you provide an example .csv or .txt file for us to structure our data so that it is readable by Vosviewer? A public link (google or onedrive) for downloading the example file would help? I can also email you if you'd like.
    Reply
  • Toyosi George February 15th, 2021 9:35 am
    I am trying to do co-authorship participation of authors. For an author, I screened and vetted his number of publications to be 142. Vosviewer analysis keeps bringing 96. This same thing appears for other authors with many publications on Scopus on the subject but yet Vosviewers keeps reducing the number of co-authorship. What can be done?
    Reply
  • Anthony Macedo February 12th, 2021 3:29 pm
    Greetings,
    Doing a co-occurrence map based on text data, I am aware of the technique of using a thesaurus file to merge two or more terms. However, I would like to know if it is possible to split one term in two terms.
    For example, in the title “European club capitalism and FIFA redistribution models”, VOSviewer identifies “fifa redistribution model”, but I would prefer to identify “fifa” + “redistribution model”.
    Best regards.
    Reply
    • Ludo Waltman February 12th, 2021 6:49 pm
      I am afraid VOSviewer doesn't enable you to split terms.
      Reply
  • Chiara February 7th, 2021 12:27 pm
    Goodmorning!
    I have uploaded on VOSviewer a .csv file and it works except for the function "co-occurrence".
    I've tried with other .csv files too, but it is always impossible to select the function "co-occurrence", that is the one that interests me the most.
    Could you help me?
    Thank you very much,
    Chiara
    Reply
    • Ludo Waltman February 7th, 2021 12:45 pm
      What is the source of your data?
      Reply
    • Chiara Bernardini February 12th, 2021 4:47 pm
      Scopus
      Reply
      • Chiara Bernardini February 12th, 2021 6:58 pm
        Scopus is a valid source of data, isn't it?
        Reply
    • Wing March 11th, 2021 9:59 pm
      I also have the same problem. Many times I cannot select "co-occurrence", mostly if I use single *.RIS as input file. Sometimes, it works if I use several RIS files, but sometimes it does not work, too. I still cannot figure out why co-occurrence sometimes available and some other times don't.
      Reply
      • Ludo Waltman March 11th, 2021 10:08 pm
        The co-occurrence option should be available if your input file (e.g., Scopus CSV file, RIS file, or something else) includes keywords. If it does not include keywords, the co-occurrence option won't be available in VOSviewer.
        Reply
  • Praveen KV February 5th, 2021 12:33 pm
    Thanks for this wonderful tool.
    I just need to know is it possible to edit labels on a map. Specifically, I need to modify the country names in co-authorship network of countries. For example I need to change 'people republic of china' to 'China' in the final map. Kindly guide me in this.
    Thanks
    Reply
    • Ludo Waltman February 6th, 2021 9:09 am
      This can be done by saving your map in a VOSviewer map file and by editing the 'label' column in this file using a spreadsheet program such as MS Excel.
      Reply
      • Praveen KV February 6th, 2021 11:35 am
        Thanks Ludo for the help.
        I am however stuck at the next step. Though I could edit the label, lines are not enabled in the map when visualised after editing.
        Is there a way to enable lines.
        Thanks
        Reply
        • Praveen KV February 6th, 2021 11:43 am
          Thanks again...
          Please dont bother...I figured it out..
          cheers
          Reply
  • Rafael Oliveira February 2nd, 2021 9:44 pm
    Dear Ludo, I would like to kindly ask why the association strength is not employed by both VOSviewer and CitNetExplorer. I believe that your papers were very convincing to the adequacy of the association strength as the normalization method. And yet it is employed by only one of your softwares. Thank you in advance. Rafael.
    Reply
    • Ludo Waltman February 6th, 2021 9:22 am
      This is a very interesting question. Unlike VOSviewer, CitNetExplorer indeed does not use the association strength. The visualizations created by CitNetExplorer are of a very different nature than the ones created by VOSviewer, and they therefore do not need a normalization method. The clustering solutions that can be created using CitNetExplorer rely on a normalization method that is referred to as fractionalization in VOSviewer. For the specific purpose of clustering documents, we believe that this normalization method is more suitable than the association strength. An argument in support of the use of fractionalization for clustering documents is presented in the following paper: https://doi.org/10.1002/asi.22748 / https://arxiv.org/abs/1203.0532.
      Reply
  • Lora January 29th, 2021 3:55 pm
    Thank you very much for the VOSviewer. My colleagues are working on an author analysis. We created our thesaurus and have begun our analyses. Our issue is that we have one author whose name appeared several ways in our RIS data. We double checked our thesaurus - however he still appears as multiple nodes. Other folks on our thesaurus are appropriately identified. What might be causing this anomaly?
    Reply
  • Mustafa POLAT January 28th, 2021 9:11 pm
    Hello!
    I downloaded the data from Web of Science (from the Export option by choosing Other File Formats option, Tab-delimited file format and the Full Record and Cited References option) but when I want to do a keyword co-occurence analysis based on bibliographic data, I can only select "author keywords". The software doesn't allow me to choose "all keywords" or "KeyWords Plus" as a unit of analysis. What's the reason and how can I handle it ? Thanks for your answers in advance!
    Reply
    • Wing Wahyu Winarno February 23rd, 2021 7:04 pm
      I have the same problem. I work on Windows 10 64 bit, VOSviewer 1.6.16.
      Reply
  • Vanes January 25th, 2021 2:41 pm
    Hello!
    I'm trying to open a CSV file which I downloaded from Scopus, but an error message "Error while reading VOSviewer map file (line1)": XXX is not a valid column header." pops up. As advised, I removed unnecessary information before downloading the CSV file from Scopus, but the message keeps coming back. I tried several times with less and less information on my CSV file, but still the same with new XXX each time .
    How can I resolve this??
    Thank you!
    Reply
    • Ludo Waltman January 26th, 2021 9:00 am
      Could you send your file to vosviewer@cwts.leidenuniv.nl? I will then try to take a look at your problem.
      Reply
      • Anil Kumar April 8th, 2021 8:32 am
        Dear Ludo,
        I have install the software in my desktop but I am unable to do citation analysis, bibliographic coupling and co-citation analysis. I have downloaded my file from Scopus and its a .csv file. I can do ao-authroship analysis and co-occurence analysis. Kindly help me what should I do now
        Reply
        • Ludo Waltman April 8th, 2021 8:37 am
          When exporting data from Scopus to a CSV file, the reference lists of publications are by default not included. VOSviewer then cannot create citation-based maps. When exporting data from Scopus, you need to make sure that the reference lists of publications are included. There is an option in Scopus to manually selected the data elements to be included in the exported data.
          Reply
  • Thilini January 21st, 2021 9:33 pm
    In VOSviewer the the types of analysis options are not active. How can I solve this problem?
    Reply
    • Ludo Waltman January 24th, 2021 2:51 pm
      The availability of the options depends on the data that is provided as input to VOSviewer. If certain data elements are missing, the corresponding options won't be available.
      Reply
  • Debasish panda January 18th, 2021 3:40 pm
    I have uploaded the ris file but I couldn't get all the option of country , citation options
    Reply
    • Ludo Waltman January 24th, 2021 3:36 pm
      The required data for these options is not available in a RIS file. VOSviewer therefore doesn't offer these options.
      Reply
  • Arzu Er January 18th, 2021 8:34 am
    I cannot see the links between labels on the map. There is no lines part in the interface. can you help me?
    Reply
  • Nilay January 15th, 2021 4:49 pm
    Hello,
    I have a problem that I could not solve for a long time. I tried with three different computers (both windows and mac OS). Hope that you can help me about it. After I made a cluster analysis on Vosviewer, I save both map and network files. However, these files do not include the information related to "url". "Url" column exists in the file but it is empty. Therefore, I cannot see the documents' DOI numbers that will enable me to merge with other databases. I am sure that it is not related to the Web of Science data, as DOI numbers exist in WOS data file.
    Hope that you can help me,
    Nilay
    Reply
  • Vasyl January 13th, 2021 1:33 pm
    Dear peter Kokol,
    I am using VOSviewer with Scopus it giving error on although i have downloaded papers and saved . The error title is
    " While reading Scopus File, cannot find Authors, Keyword ....
    I will be glad for your feedback thank you
    Reply
  • Lauren Maggio January 3rd, 2021 10:25 pm
    Hello,
    First thank you for your awesome tool and for making them freely accessible.
    I'm trying to make a map using WoS data. Before the new year, I was able to download the full citation and metadata in batches of 500 as recommended in the tutorial. After the new year, I now only have the option for author, title, source, abstract, which seems to severely restrict the types of maps I can generate. I tried from two different university accounts to get the fuller txt files. I also tried the classic version and new beta of the platform. Is this something specific to my universities or is this a change across the web of science? If so, any suggestions for generating maps beyond author co-occurrences (e.g., country/institution/citations) using WoS?
    Thank you!
    Reply
    • Ludo Waltman January 4th, 2021 10:29 pm
      In the new Web of Science, the export features still seem to be quite limited. Hopefully this will improve soon. However, in the classic Web of Science, it seems that nothing has changed in the export features. My recommendation therefore is to use the classic Web of Science. In addition, make sure to work with the Web of Science Core Collecton, not with All Databases.
      Reply
    • Tahir January 5th, 2021 8:27 am
      Lauren Maggio,
      I have also found this issue today. What i did is, opened my University e-library link and found another link to open web of sciences and it works. I don't know the back side technical details why it works via e-lib link. I just shared my experience may be it works for you. Thank you.
      Reply
  • Amir Ashrafi December 28th, 2020 10:22 pm
    Hi team,
    I have downloded articles metadata from different databases and import all of them into endnote for literature review. After two rounds of data refinement and cleaning unrelated articles, I want to import the final sample into Vosviewer.
    However, I have got an error in reading file.
    Would you please help me to solve it.
    Reply
    • Ludo Waltman December 30th, 2020 9:53 am
      The possibilities for working with EndNote data in VOSviewer are limited. The file format currently used by EndNote is not supported by VOSviewer. You may try to provide your data as input to VOSviewer in a RIS file. This will enable you to create co-authorship maps and term co-occurrence maps.
      Reply
  • Mustafa POLAT December 20th, 2020 5:40 pm
    For those having problems with creating thesaurus files:
    • In the map you will often see terms in singular and plural form or with/without a hyphen
    (-), etc. You can merge these keywords by using a thesaurus file (in the step Choose type
    of analysis and counting method). Create a two-column table in Excel. Name the first
    column label and list the keywords you want to delete. Name the second column replace
    by and enter the replacement keywords. If you leave the cell in the column ‘replace by’
    empty, the keyword in the column ‘label’ will be removed.
    Save this file as a text-file (tab delimited). You can upload the file in the step ‘Choose type
    of analysis and counting method’.
    • If you want to save a picture of the map, click Screenshot on the left side of the screen
    and choose Save to File.
    • You can adjust the clustering: under Analysis > Clustering the default clustering resolution
    is 1.00. When you enlarge the resolution (for example 1.20), you get more clusters. With a
    smaller value, you get less clusters.
    • You can see the keywords under the tab Items.
    • Click Save > Map to download the list of keywords in the map
    (Source: https://redesigninginformationliteracyeur.files.wordpress.com/2017/05/iss_scoping_search_development_studies_and_global-south-vosviewer.pdf)
    Reply
  • Bishawjit Mallick December 18th, 2020 5:44 pm
    Hi,
    I am facing trouble of presenting the lower case characters to uppercase, at least the first letter of each word I want in upper case in the map. Can you please suggest me how can I correct this problem?
    Thanks in advance for your supports.
    Bishawjit Mallick
    Reply
    • Ludo Waltman December 19th, 2020 6:01 pm
      This issue is discussed below, on December 1, 2020.
      Reply
  • Dominic Agyei December 7th, 2020 1:18 am
    Hello Team,
    I just downloaded VOSviewer but I need your assistance in clearing an error in a .csv file containing data.
    This is the error I keep receiving when analysing the data:
    'Error while reading Scopus file 'Scopus_exported_refine_values (8).csv' (line 8): Incorrectnumber of columns"
    Thanks.
    Reply
    • Ludo Waltman December 10th, 2020 10:50 pm
      Unfortunately Scopus CSV files regularly cause problems. This is due to small bugs in the CSV export feature in Scopus. When you export a CSV file from Scopus, you can choose which data elements you want to include in the file. My advice is to try out different choices and to leave out data elements that you don't need (e.g., funding information). By leaving out the right data elements, it is usually possible to circumvent problems with the CSV export feature in Scopus.
      Reply
  • giuseppe vito December 5th, 2020 8:17 am
    Dear Ludo, i am really very grateful for your answer. See you soon.
    Reply
  • giuseppe vito December 4th, 2020 12:12 pm
    Hi Ludo, sorry for bothering you but I feel the need of a comparison and a comfort: what do you think about coupling and mapping references on the basis of keywords (column DE in a WoS file) and not (or also) on the basis of cited references (column CR)? Thanks for your attention and my best wishes for the upcoming holidays.
    Reply
    • Ludo Waltman December 4th, 2020 10:48 pm
      This is definitely an option. VOSviewer doesn't provide built-in functionality for creating such a 'keyword coupling map', but you could create it by processing the WoS data yourself and by providing the resulting 'keyword coupling network' as input to VOSviewer in a VOSviewer network file.
      Reply
  • Mihiretu Kebede December 4th, 2020 11:15 am
    Do you have an R package for VOSviewer? It will be a great hit.
    Reply
    • Ludo Waltman December 4th, 2020 10:54 pm
      I don't think such an R package exists.
      Reply
  • Mirian Moreira December 4th, 2020 2:37 am
    Hi!
    Could you help me with a situation? I am using a thesaurus with the intention of to combine some keywords that have the same meaning, however, I am not successful in the sum of the occurrences with some of these words. For example, I am trying to combine “human - 20 occurrences” with “humans - 17 occurrences”, however replacing “human” with “humans” I get 20 occurrences and not 37. I emphasize that this failure does not occur with so many other words used in the same thesaurus. In these cases, the sum occurs as expected. I appreciate if you can help me.
    Reply
    • Ludo Waltman December 4th, 2020 11:13 pm
      If you send your files to vosviewer@cwts.leidenuniv.nl, I will try to take a look at your problem.
      Reply
      • Mirian Moreira December 6th, 2020 1:20 pm
        Thank you so much, Ludo! I'll do it.
        Reply
  • Sheng Liu December 1st, 2020 8:34 am
    Hello, how can I set not to convert to lowercase letters in the process of importing data?
    Reply
    • Ludo Waltman December 1st, 2020 10:49 am
      The conversion from upper case to lower case cannot be turned off. It is necessary because some data sources use upper case and lower case in an inconsistent way. To handle these inconsistencies, VOSviewer converts all upper case characters to lower case when a new map is created.
      After you have created a map, you can save the map in a VOSviewer map file. This file can then be edited in a spreadsheet program such as MS Excel. By editing the labels in the 'label' column, you can convert lower case characters to upper case.
      Reply
      • Neha March 19th, 2021 7:05 pm
        Please provide the video for the same.
        Reply
  • Rajesh Godasu November 30th, 2020 10:16 pm
    Hi,
    is there a video on how to upload the maps online?
    Reply
    • Ludo Waltman December 1st, 2020 12:04 am
      I am afraid there is no such video. By the way, in the near future, we expect to release a web-based version of VOSviewer, which will make it easier to make maps available online.
      Reply
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