Item response tree (IRTree) models are a flexible framework to control self-reported trait measurements for response styles. To this end, IRTree models decompose the responses to rating items into sub-decisions, which are assumed to be made on the basis of either the trait being measured or a response style, whereby the effects of such person…

The extent to which college students performed differentially on 3 x 3 figural analogies administered under two elaborative testing conditions was investigated. Results indicated that subjects who demonstrated a preferred testing condition performed more effectively upon retesting than did a control group not displaying differential performance as…

Threedifferent statistical procedures for identifying aptitude-treatment interactions are discussed: (1) treatment x blocks analysis of variance (2) homogeneity of groups regressions and (3) extreme groups analysis. (Author)

This paper reports a Monte Carlo study of differences induced by different analysis choices over selected types of aptitude treatment interaction (ATI) data (nine combinations of three sample sizes and three population parameter effect sizes). Generally, ANOVA methods tended to overestimate smaller effect sizes and to underestimate larger effect…

Develops a testing procedure based on a model including treatment effects on residual variances. (Author/RC)

The interaction of mental ability and of two different instructional methods was investigated for a second grade linear metric curriculum unit. Mental ability was positively correlated with achievement under the guided discovery method, but essentially uncorrelated for the self paced mastery learning method. (Author/JKS)