Figure 4
Comparison of ranking results between search engines. A) Low degree of the overlap between PubFocus, Google™ Scholar and Scirus™ for the top 10 ranked citations. PubFocus (with Google™ Scholar as the source of forward citations) and Google™ Scholar had 12.6% of common citations. PubFocus (with Google™ Scholar as the source of forward citations) and Scirus™ had only 3.2% of common citations, and Google™ Scholar and Scirus™ had only 2.6% of citations in common. B) 49% of identical top 10 ranked citations were returned by PubFocus when Google™ Scholar and PubMed Basic sources of forward citations were used as alternative. C) Partial overlap of the top 10 ranked authors between PubFocus and Web of Science®. PubFocus (based on Author's rank with Google™ Scholar as the source of forward citations) and Web of Science® (volumetric statistics on all authors) had 33% of common authors. 36% of authors were the same between two PubFocus outputs based on Author's rank and volumetric data. Volumetric Web of Science® and volumetric PubFocus results had 35% of common authors. D) 64% of identical top 10 authors were returned by PubFocus when Google™ Scholar or PubMed Basic sources of forward citations were used in Authors' rank calculation.