What question did this study set out to answer?

This study aims to provide up-to-date comparative information on the sizes of popular academic search engines and bibliographic databases.

November 10, 2018ScientometricsOpen Access

Google Scholar to overshadow them all? Comparing the sizes of 12 academic search engines and bibliographic databases

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Comparative analysis estimates sizes of 12 academic search engines, indicating Google Scholar is the largest.

This study aims to provide up-to-date comparative information on the sizes of popular academic search engines and bibliographic databases.
Comparative analysis of 12 ASEBDs using query hit data as an indicator of accessible records.
Iterative query optimization to identify maximum hits for most ASEBDs.
Validation of results through comparison with official database sizes and previous studies.
Google Scholar is estimated to have 389 million records, making it the most comprehensive academic search engine.
Size estimates for ProQuest and EbscoHost were provided for the first time.
Google Scholar's size may have previously been underestimated by over 50%.

Michael Gusenbauer (2018) studied this question.

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