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Extensions of Generalizability Theory through the Principle of Symmetry.

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Allal, Linda – 1986

This paper discusses the theoretical scope and practical applicability of generalizability (G) theory through the principle of symmetry. Major ideas are summarized and factors hindering applications of G theory in research conducted in French-speaking Europe are presented. The principle of symmetry affirms that any factor of a design can be…

Descriptors: Data Collection, Educational Research, Factor Analysis, Factor Structure

Adjusting for Confounding Factors in Quasi-Experiments: Another Reanalysis of the Westinghouse Head Start Evaluation.

Magidson, Jay; Sorbom, Dag – 1980

Evaluations of social programs based upon quasi-experimental designs are typically plagued by problems of nonequivalence between the experimental and comparison group prior to the experiment. In such settings it is extremely difficult, if not impossible, to isolate the effects of the program from the confounding effects associated with the…

Descriptors: Control Groups, Correlation, Evaluation Methods, Experimental Groups