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In statistics, the Kuder–Richardson Formula 20 (KR-20) first published in 1937 is a measure of internal consistency reliability for measures with dichotomous choices. - read more

Describes how to calculate the Kuder and Richardson Formula 20 (KR20) and Kuder and Richardson Formula 21 (KR21) measures of reliability in Excel. Real Statistics Using Excel. ... The value ρ KR20 = 0.738 shows that the test has high reliability. - read more

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