Article commented on a study by Harris, who presented formulas for the variance of errors of estimation (of a true score from an observed score) and the variance of errors of prediction (of an observed score from an observed score on a parallel test). (Author/RK)

Author replies to article TM 500 559. (MB)

This article is a reply to a previous paper (see TM 500 488) interpreting Livingston's original article (see TM 500 487). (CK)

The assumptions of the classical test-theory model are used to develop a theory of reliability for criterion-referenced measures which parallels that for norm-referenced measures. It is shown that the Spearman-Brown formula holds for criterion-referenced measures and that the criterion-referenced reliability coefficient can be used to correct…

A reliability coefficient for criterion-referenced tests is developed from the assumptions of classical test theory. The coefficient is based on deviations of scores from the criterion score, rather than from the mean. (Author/CK)

This issue of Measurement in Education is presented in the form of a dialogue between Dr. Robert L. Ebel, Distinguished Professor of Educational Measurement at Michigan State University, and Dr. Samual A. Livingston, Program Research Scientist at the Educational Testing Service. Alternative views on some aspects of the use of tests in assessing…