On Test Homogeneity and Maximum KR-20
Nambury S. Raju · Educational and Psychological Measurement · 1982
In this article, a necessary and sufficient condition for a perfectly homogeneous test in the sense of Loevinger is stated and proved. Using this result, a formula for computing the maximum possible KR-20 when the test variance is assumed fixed is presented. A new index of test homogeneity is also presented and discussed.