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- Kuder–Richardson_Formula_20 abstract "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. It is analogous to Cronbach's α, except Cronbach's α is also used for non-dichotomous (continuous) measures. It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like Cronbach's α, homogeneity (that is, unidimensionality) is actually an assumption, not a conclusion, of reliability coefficients. It is possible, for example, to have a high KR-20 with a multidimensional scale, especially with a large number of items. Values can range from 0.00 to 1.00 (sometimes expressed as 0 to 100), with high values indicating that the examination is likely to correlate with alternate forms (a desirable characteristic). The KR-20 may be affected by difficulty of the test, the spread in scores and the length of the examination.In the case when scores are not tau-equivalent (for example when there is not homogeneous but rather examination items of increasing difficulty) then the KR-20 is an indication of the lower bound of internal consistency (reliability).Th formula for KR-20 for a test with K test items numbered i=1 to K is where pi is the proportion of correct responses to test item i, qi is the proportion of incorrect responses to test item i (so that pi + qi = 1), and the variance for the denominator iswhere n is the total sample size.If it is important to use unbiased operators then the sum of squares should be divided by degrees of freedom (n − 1) and the probabilities are multiplied by Since Cronbach's α was published in 1951, there has been no known advantage to KR-20 over Cronbach. KR-20 is seen as a derivative of the Cronbach formula, with the advantage to Cronbach that it can handle both dichotomous and continuous variables. The KR-20 formula can't be used when multiple-choice questions involve partial credit, and it requires detailed item analysis.".
- Kuder–Richardson_Formula_20 wikiPageID "1465121".
- Kuder–Richardson_Formula_20 wikiPageRevisionID "590039440".
- Kuder–Richardson_Formula_20 subject Category:Comparison_of_assessments.
- Kuder–Richardson_Formula_20 subject Category:Educational_psychology_research_methods.
- Kuder–Richardson_Formula_20 subject Category:Psychometrics.
- Kuder–Richardson_Formula_20 comment "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. It is analogous to Cronbach's α, except Cronbach's α is also used for non-dichotomous (continuous) measures. It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test.".
- Kuder–Richardson_Formula_20 label "Formule 20 de Kuder-Richardson".
- Kuder–Richardson_Formula_20 label "Kuder-Richardson Formule 20".
- Kuder–Richardson_Formula_20 label "Kuder-Richardson-Formel".
- Kuder–Richardson_Formula_20 label "Kuder–Richardson Formula 20".
- Kuder–Richardson_Formula_20 sameAs Kuder%E2%80%93Richardson_Formula_20.
- Kuder–Richardson_Formula_20 sameAs Kuder-Richardson-Formel.
- Kuder–Richardson_Formula_20 sameAs Formule_20_de_Kuder-Richardson.
- Kuder–Richardson_Formula_20 sameAs Kuder-Richardson_Formule_20.
- Kuder–Richardson_Formula_20 sameAs Q916953.
- Kuder–Richardson_Formula_20 sameAs Q916953.
- Kuder–Richardson_Formula_20 wasDerivedFrom Kuder–Richardson_Formula_20?oldid=590039440.