Typically, about 80 percent of total project efforts is spent on data acquisition and preprocessing; yet well prepared data is mandatory to arrive at high-quality results. Datasets might be acquired via questionnaires, crawled from the Web, downloaded from a database, or accessed as a continuous data stream. Datasets differ by their coverage and resolution of time (days, months, years), geography (languages and/or countries considered), and topics (disciplines and selected journal sets). Their size ranges from several bytes to terabytes (trillions of bytes) of data. They might be high-quality materials curated by domain experts or random content retrieved from the Web. Based on a detailed needs analysis and deep knowledge about existing databases, the best suited yet affordable datasets have to be selected, filtered, integrated, and augmented. It may also be necessary for networks to be extracted (see section 4.7 Network Analysis for details).
Refer was one of the first digital reference managers, developed by Bell labs in 1978. Refer's file output format has since been adopted by many tools and web services, including BibIX for UNIX, early versions of EndNote, CiteSeerX, Zotero.
Data in refer-formatted files can be used for the following types of analyses:
Like Refer, BibTeX provides a standard reference file format used by many tools and web services, including CiteSeerX, citeulike, BibSonomy, and Google Scholar.
Data in BibTex files can be used for the following types of analyses:
ISI Web of Science (WoS) is a leading citation database cataloging over 10,000 journals and over 120,000 conferences. Access it via the "Web of Science" tab at http://www.isiknowledge.com (note: access to this database requires a paid subscription). Along with Scopus, ISI WoS provides some of the most useful datasets for scientometric analysis.
To find all publications by an author, search for the last name and the first initial followed by an asterisk in the author field. To find papers by Eugene Garfield, enter Garfield E* in the author field. The search yielded 1,529 results on November 11th 2009, 500 of which can be downloaded at a time, see Figure 4.2.
Figure 4.2: ISI Web of Science search interface and ISI Web of Science search results
Download the first 500 records using the output box at the bottom of the page. Enter records '1' to '500', select 'Full Record' and 'plus Cited Reference', select 'Save to Plain Text' in the drop down menu, and then click save. Wait for the processing to complete, and then save the file as GarfieldE.isi. The resulting file can be seen in Figure 4.3.
Figure 4.3: Saving records from Web of Science and viewingGarfieldE.isi
ISI files are loosely based on the RIS file format, and data in this format can be used for the following types of analyses:
Elsevier's Scopus, like ISI Web of Science, has an extensive catalog of citations and abstracts from journals and conferences. Subscribers to Scopus can access the service via http://www.scopus.com.
To find all articles whose abstract, title, or keywords include the terms 'Watts Strogatz Clustering Coefficient', simply enter those terms in the Article/Abstract/Keywords field. Twenty-five results were found as of November 11th, 2009. Download up to 2,000 references by checking the 'Select All' box and clicking 'Output'.
Figure 4.4: Scopus search interface and Scopus search results
At the output window, select 'Comma separated file, .csv' (e.g. Excel) and 'Complete format' from the drop-down menus and choose 'Export'. Save the file as WattsStrogatz.scopus. The resulting file can be seen in Figure 4.5.
Figure 4.5: Saving records in Scopus and viewing WattsStrogatz.scopus
Data in Scopus files can be used for the following types of analyses:
Google Scholar data can be acquired using Publish or Perish (Harzing, 2008) that can be freely downloaded from http://www.harzing.com/pop.htm. A query for papers by Albert-László Barabási run on Sept. 21, 2008 results in 111 papers that have been cited 14,343 times, see Figure 4.6.
Figure 4.6: Publish or Perish search results for Albert-László Barabási and viewing barabasiPoP.csv
To save records, select 'File > Save' from menu and then choose the appropriate file format (.csv, *.enl, or *.bib) in the 'Choose File' pop-up window. All three file formats can be read by the Sci2 Tool. The result in all three formats named 'barabasi.' is also available in the respective subdirectories in 'yoursci2directory /sampledata/scientometrics/' and will be used later in this tutorial.
Data from Google Scholar can be used for the following types of analyses:
Data from Google Scholar can also be gathered based on Google Citation user IDs. Once any dataset with author information has been loaded into Sci2 (.isi, .enl etc.) run File > Google Scholar > Google citation user ID search' with the following parameter:
A list of authors for whom no Google Citation user ID could be found will print in the console. A table will be generated for those authors for whom Google Citation IDs could be found in the data manager:
Based on this table a variety of algorithms that require the Google Citation User ID as an input parameter can be run:
Please note that before any of the following algorithms can be run, the Google Citation User ID Search algorithm must be run to retrieve the Google Citation User IDs.
Attach citation Citation Table from Google Scholar
This algorithm creates a series of tables, one for each Google User ID, and creates tables with citation information for each Google Citation ID. Run 'File > Google Scholar > Attach Citation Table from Google Scholar' with the default parameter.
Attach citation indices from Google Scholar
This algorithm will create a citation index of the authors from the original file based on their Google Citation user ID (for those who have one). Run 'File > Google Scholar > Attach citation indices from Google Scholar' with the default parameter.
Funding data provided by the National Science Foundation (NSF) can be retrieved via the Award Search site (http://www.nsf.gov/awardsearch). Search by PI name, institution, and many other fields, see Figure 4.7.
Figure 4.7: NSF 'Award Search' interface and search results page
To retrieve all projects funded under the Science of Science and Innovation Policy (SciSIP) program, simply select the 'Program Information' tab, do an 'Element Code Lookup', enter '7626' into the 'Element Code' field, and click the 'Search' button. On Sept 21st, 2008, exactly 50 awards were found. Award records can be downloaded in csv, Excel, or XML format. Save file in csv format, and change the file extension from .csv to .nsf. A sample .nsf file is available in 'yoursci2directory /sampledata/scientometrics/nsf/BethPlale.nsf'. In the Sci2 Tool, load the file using 'File > Load File'. Select "NSF csv format" in the "Load" pop-up window. A table with all records will appear in the Data Manager. View the file in Excel.
Data in NSF files can be used for the following types of analyses:
Funding data provided by the National Institutes of Health (NIH), and associated publications and patents, can be retrieved via the NIH RePORTER site (http://projectreporter.nih.gov/reporter.cfm). The database draws from eRA, Medline, PubMed Central, NIH Intramural, and iEdison. Search by location, PI name, category, etc., see Figure 4.8.
Figure 4.8: NIH RePORTER search interface and search results page
A sample search of "Epidemic" in the 'Public Health Relevance' field displays 205 results as of November 11th, 2009. Up to 500 results can be exported into csv or Excel format using the "Export" button at the top of the page. Save the file as a .csv and load it into the Sci2 Tool using 'File > Load File' to perform temporal or topical analyses.
Data in NIH files can be used for the following types of analyses:
Figure 4.9: Graph of the numbers of records published each year by various organizations
Medline, U.S. patent, as well as funding data provided by the National Science Foundation and the National Institutes of Health can be downloaded from the Scholarly Database (SDB) at Indiana University. SDB supports keyword based cross-search of the different data types and data can be downloaded in bulk, see Figures 4.10 and 4.11 for interface snapshots.
Register to get a free account or use 'Email: firstname.lastname@example.org' and 'Password: nwb' to try out functionality.
Search the four databases separately or in combination for 'Creators' (authors, inventors, investigators) or terms occurring in 'Title,' 'Abstract,' or 'All Text' for all or specific years. If multiple terms are entered in a field, they are automatically combined using the Boolean operator 'OR.' Entering 'breast cancer' will match any record with 'breast' or 'cancer' in that field. Using the Boolean operator AND (for example, 'breast AND cancer') would only match records that contain both terms. Double quotations can be used to match compound terms, e.g., "breast cancer" retrieves records with the phrase "breast cancer," but not records where 'breast' and 'cancer' are present in isolation. The importance of a particular term in a query can be increased by putting a ^ and a number after the term. For instance, 'breast cancer^10' would increase the importance of matching the term 'cancer' by ten compared to matching the term 'breast.'
Figure 4.10: Scholarly Database 'Home' page and 'Search' interface
Results are displayed in sets of 20 records, ordered by a Solr internal matching score. The first column represents the record source, the second the creators, third comes the year, then title and finally the matching score. Datasets can be downloaded in different subsets and formats for future analysis.
Figure 4.11: Scholarly Database search results and download interfaces
Data from the SDB can be used in a great number of ways. The following is an abridged list of suggested uses: