This study examined the utility of response time-based analyses in understanding the behavior of unmotivated test takers. For the data from an adaptive achievement test, patterns of observed rapid-guessing behavior and item response accuracy were compared to the behavior expected under several types of models that have been proposed to represent…

A simple unbalanced block model is proposed for examination marks, as an improvement on the usual implicit model. The new model is applied to some real data and is found, by the usual normal linear theory F test, to give a highly significant improvement. Some alternative models are also considered. (Author)

Results of applying different aptitude-achievement discrepancy models for test scores were compared for 150 second, 150 third, 150 fourth, and 130 fifth graders in several school systems in the Southeast who had been referred for psychoeducational testing for learning disabilities to determine whether different groups of students were identified…