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Published online by Cambridge University Press: 01 January 2025
“Improper linear models” (see Dawes, Am. Psychol. 34:571–582, 1979), such as equal weighting, have garnered interest as alternatives to standard regression models. We analyze the general circumstances under which these models perform well by recasting a class of “improper” linear models as “proper” statistical models with a single predictor. We derive the upper bound on the mean squared error of this estimator and demonstrate that it has less variance than ordinary least squares estimates. We examine common choices of the weighting vector used in the literature, e.g., single variable heuristics and equal weighting, and illustrate their performance in various test cases.
Much of this work was made possible by a predoctoral trainee fellowship awarded to the first author from the National Institutes of Mental Health under Training Grant Award Nr. PHS 2 T32 MH014257 entitled “Quantitative Methods for Behavioral Research” (to M. Regenwetter, PI). The first author was also supported by a Dissertation Completion Fellowship awarded by the University of Illinois. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the National Institutes of Mental Health or the University of Illinois. We would like to thank Lawrence Hubert and Konstantinos Katsikopoulos for comments on an earlier draft. We would also like to thank the editor, action editor, and three anonymous referees for their comments and suggestions.