Although collecting data from multiple informants is highly recommended, methods to model the congruence and incongruence between informants are limited. Bauer and colleagues suggested the trifactor model that decomposes the variances into common factor, informant perspective factors, and item-specific factors. This study extends their work to the…

Nine indices of response pattern appropriateness were compared, based on item response theory, with respect to their relation to the total test score and their effectiveness in detecting unusual response patterns. The ability to differentiate between three groups was compared: cooperative examinees, uncooperative examinees, and randomly generated…