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COVID-19, the Yule-Simpson paradox and research evaluation #MMPMID33583976
Wang Z; Rousseau R
Scientometrics 2021[]; 126 (4): 3501-3511 PMID33583976show ga
The Yule-Simpson paradox refers to the fact that outcomes of comparisons between groups are reversed when groups are combined. Using Essential Sciences Indicators, a part of InCites (Clarivate), data for countries, it is shown that although the Yule-Simpson phenomenon in citation analysis and research evaluation is not common, it isn't extremely rare either. The Yule-Simpson paradox is a phenomenon one should be aware of, otherwise one may encounter unforeseen surprises in scientometric studies.