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West, Leo H. T.; Theobald, John H. – 1981
This paper describes an analytical solution to a common problem in aptitude-treatment interaction (ATI). The researcher is often interested in the comparison between treatments for a large set of attributes. If this set is large, the chance of non-orthogonality is correspondingly large. In these circumstances the analysis and interpretation…
Descriptors: Academic Achievement, Aptitude Treatment Interaction, Biology, Foreign Countries
Peer reviewedWinne, Philip H.; Walsh, John – Journal of Educational Psychology, 1980
Yarworth and Gauthier (EJ 189 606) examined whether self-concept variables enhanced predictions about students' participation in school activities, using unstructured stepwise regression techniques. A reanalysis of their data using hierarchial regression models tested their hypothesis more appropriately, and uncovered multicollinearity and…
Descriptors: Extracurricular Activities, High Schools, Hypothesis Testing, Multiple Regression Analysis
Download full textSt. Pierre, Robert G.; Proper, Elizabeth C. – 1976
A general interest in attrition, or loss of units from a study, stems in part from the observation that the infrequency of attention to attrition exacerbates problems of data interpretation. As a substudy of the national evaluation of Project Follow Through, the potential biasing effects of attrition of subjects from the sites were investigated.…
Descriptors: Analysis of Covariance, Attrition (Research Studies), Compensatory Education, Data Collection
