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Comment
.2021 Mar;12(2):126-135.
doi: 10.1002/jrsm.1456. Epub 2020 Oct 8.

Commentary to Gusenbauer and Haddaway 2020: Evaluating retrieval qualities of Google Scholar and PubMed

Affiliations
Comment

Commentary to Gusenbauer and Haddaway 2020: Evaluating retrieval qualities of Google Scholar and PubMed

D V Klopfenstein et al. Res Synth Methods.2021 Mar.

Abstract

We read with considerable interest the study by Gusenbauer and Haddaway (Gusenbauer and Haddaway, 2020, Research Synthesis Methods, doi:10.1002/jrsm.1378) comparing the systematic search qualities of 28 search systems, including Google Scholar (GS) and PubMed. Google Scholar and PubMed are the two most popular free academic search tools in biology and chemistry, with GS being the number one search tool in the world. Those academics using GS as their principal system for literature searches may be unaware of research which enumerates five critical features for scientific literature tools that greatly influenced Gusenbauer's 2020 study. Using this list as the framework for a targeted comparison between just GS and PubMed, we found stark differences which overwhelmingly favored PubMed. In this comment, we show that by comparing the characteristics of the two search tools, features that are particularly useful in one search tool, but are missing in the other, are strikingly spotlighted. One especially popular feature that ubiquitously appears in GS, but not in PubMed, is the forward citation search found under every citation as a clickable Cited by N link. We seek to improve the PubMed search experience using two approaches. First, we request that PubMed add Cited by N links, making them as omnipresent as the GS links. Second, we created an open-source command-line tool, pmidcite, which is used alongside PubMed to give information to researchers to help with the choice of the next paper to examine, analogous to how GS's Cited by N links help to guide users. Find pmidcite at https://github.com/dvklopfenstein/pmidcite.

Keywords: MEDLINE; PubMed; bibliometrics; manuscripts as topic; open access publishing; publications; reproducibility; search engine.

© 2020 The Authors. Research Synthesis Methods published by John Wiley & Sons Ltd.

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Conflict of interest statement

The authors declare no potential conflict of interests.

Figures

FIGURE 1
FIGURE 1
Scientific search interface requirements. PubMed fully implement's Boeker et al's required list of characteristics for systematic search interfaces, while GS's implementation provides minimal support. But PubMed does not implement the extremely popularCited by N links seen throughout Google Scholar
FIGURE 2
FIGURE 2
Most of the coverage of PubMed is indexed in the MEDLINE database and the PMC database. The coverage of PubMed is shown on the horizontal axis. The top two bars on the vertical axis show two overlapping databases indexed by PubMed. The bottom orange bar indicates PubMed citations not found in the two major databases. About 88.5% of the ∼30.5 million citations accessible through PubMed are in the MEDLINE database (top blue bars) or are about to be added to (top green bars) the MEDLINE database (top blue and green bars). The MEDLINE papers that are free full‐text and are also indexed in the PMC database (middle blue and green bars) comprise over 68% of papers indexed in PMC. About 5.5% of PubMed papers are only available in PMC (middle brown bar). Almost all of the remaining 6% of full‐text papers (bottom orange bar) are behind a paywall. We queried for and downloaded34 PubMed count data and created the figure with a script available inpmidcite [Colour figure can be viewed atwileyonlinelibrary.com]
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