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Organizational Research Methods
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Controlling Nuisance Variables by Using a Matched-Groups Design

James A. Breaugh

University of Missouri-St. Louis

Jessalyn Arnold

University of Missouri-St. Louis

In this article, the authors provide an introduction to the use of a matched-groups design as a strategy for controlling nuisance variables. Building on the insightful comments of Campbell and Kenny and of Meehl, the authors utilized Monte Carlo simulations to highlight three major limitations of this control strategy (i.e., regression toward different means, systematic unmatching, and the generalizability of results) that they believe have received insufficient attention by researchers. Particular attention is given to how the effect of regression toward different means can result in researchers' drawing erroneous conclusions from their data. Recommendations for researchers considering the use of a matched-groups design are provided.

Key Words: matched-groups design • regression toward different means • systematic unmatching • controlling confounding variables • research design

Organizational Research Methods, Vol. 10, No. 3, 523-541 (2007)
DOI: 10.1177/1094428106292895
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