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Techniques for using multiple regression (MR) as a general variance-accounting procedure of great flexibility, power, and fidelity to research aims in both manipula- tive and observational psychological research are presented. As a prelude, the identity of MR and fixed-model analysis of variance/covariance (AV/ACV) is sketched. This requires an exposition of means of expressing nominal scale (qualita- tive) data as independent variables in MR. Attention is given to methods for handling interactions, curvilinearity, missing data, and covariates, for either un- correlated or correlated independent variables in MR. Finally, the relative roles of AV/ACV and MR in data analysis are described, and the practical advantages of the latter are set forth.

Multiple Regression as a General Data-Analytic System’, JacobCohenPsychological Bulletin, 70 (6) (1968): 426–443. Copyright © (1968) by the American Psychological Association. Reproduced with permission from American Psychological Association.
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