Two IRT-based procedures to estimate test reliability for a certification exam that used both adaptive (via a MST model) and non-adaptive design were considered in this study. Both procedures rely on calibrated item parameters to estimate error variance. In terms of score variance, one procedure (Method 1) uses the empirical ability distribution…

The Peabody Picture Vocabulary Test-Revised (Dunn and Dunn) is described as a convenient, quick test, possessing improvements over the original. It measures a subject's receptive (hearing) vocabulary for Standard American English. However, the validity information for the test is less than adequate, since no validity studies are presented for it.…

This study investigated correlations between the Qualitative score of the Porteus Maze Test and age and rates of recidivism of correctional institution inmates. In addition, the study was structured to provide answers to the following questions: (1) Is there a relationship between age and rates of recidivism and the Conformity-Variability score of…