In psychometrics, the Kuder–Richardson Formula 20 (KR-20), first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. It was developed by Kuder and Richardson.  The name of this formula  stems from the fact that is the twentieth formula discussed in Kuder and Richardson's seminal paper on test reliability.Kuder, G. F., & Richardson, M. W. (1937). The theory of the estimation of test reliability. Psychometrika, 2(3), 151–160.
In psychometrics, the Kuder–Richardson formulas are a measure of internal consistency reliability for measures with dichotomous choices. They was developed by Kuder and Richardson. Kuder–Richardson Formula 20 (KR-20) The name of this formula , first published in 1937, stems from the fact that is the twentieth formula discussed in Kuder and Richardson's seminal paper on test reliability.Kuder, G. F., & Richardson, M. W. (1937). The theory of the estimation of test reliability. Psychometrika, 2(3), 151–160.
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