In the past, several latent structure models have been proposed for handling problems associated with measuring the achievement of examinees. Typically, however, these models describe a specific examinee in terms of an item domain or they describe a few items in terms of a population of examinees. In this paper, a model is proposed which allows a…

These studies in test adequacy focus on two problems: procedures for estimating reliability, and techniques for identifying ineffective distractors. Fourteen papers are presented on recent advances in measuring achievement (a response to Molenaar); "an extension of the Dirichlet-multinomial model that allows true score and guessing to be…

During 1969 the International Association for the Evaluation of Educational Achievement began a series of cross-cultural studies to investigate the workings of multiple-choice achievement tests and student guessing behaviors. Empirical models to correct for guessing are discussed in terms of test item difficulty, number of response choices,…