Single-administration procedures for estimating the coefficient of agreement, a reliability index for criterion referenced tests, were recently developed by Subkoviak. The procedures require a distributional assumption for errors of measurement and an estimate of each examinee's true score. A computer simulation of tests composed of items that…

Item characteristic curve (ICC) theory describes the relationship between the ability of individuals and the probability of their answering a test question correctly; it is useful in estimating test scores, equating the scores of various tests, and scoring responses during adaptive testing. A simulation study of the effectiveness of the following…

A summary is provided of the rationale for questioning the applicability of classical reliability measures to criterion referenced tests; an extension of the classical theory of true and error scores to incorporate a theory of dichotomous decisions; a presentation of the mean split-half coefficient of agreement, a single-administration test index…