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Jacob Cohen (statistician)
Jacob Cohen (1923 – January 20, 1998) was a United States statistician and psychologist best known for his work on statistical power and effect size, which helped to lay foundations for current statistical meta-analysis〔(Cohen's entry in Encyclopedia of Statistics in Behavioral Science )〕 and the methods of estimation statistics.
He gave his name to such measures as Cohen's kappa, Cohen's d, and Cohen's h.
== Power analysis and significance testing ==
In addition to being an advocate of power analysis and effect size, Cohen was a critic of the standard significance testing procedure used in statistics, which he termed "NHST" (null hypothesis significance testing). In one example, he showed that NHST would lead us to conclude that, if all we knew about a person was that he or she was a member of congress, we would reject the null hypothesis that he or she was an American.〔http://www.johnmyleswhite.com/notebook/2012/05/12/criticism-2-of-nhst-nhst-conflates-rare-events-with-evidence-against-the-null-hypothesis/ 〕
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