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Kuder-Richardson coefficient

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In psychometrics, Cronbach's alpha coefficient of reliability in the special case of a scale with pass/fail, yes/no, or other dichotomous test items. There are two slightly different versions based on different statistical assumptions: the Kuder-Richardson 20 formula and the Kuder-Richardson 21 formula, named after equation numbers in Kuder and Richardson's 1937 article. K-R 20 or K-R 21 abbrev. [Named after the US psychologists George Frederic (Fritz) Kuder (1903–2000) and Marion Webster Richardson (1891–1965) who introduced it in an article in the journal Psychometrika in 1937]

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