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In Defense of Multiplicative Terms in Multiple Regression Equations

Robert J. Friedrich
American Journal of Political Science
Vol. 26, No. 4 (Nov., 1982), pp. 797-833
DOI: 10.2307/2110973
Stable URL: http://www.jstor.org/stable/2110973
Page Count: 37
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
In Defense of Multiplicative Terms in Multiple Regression Equations
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Abstract

Though the inclusion of multiplicative terms in multiple regression equations is often prescribed as a method for assessing interaction in multivariate relationships, the technique has been criticized for yielding results that are hard to interpret, unreliable (as a result of multicollinearity between the multiplicative term and its constituent variables), and even meaningless. An interpretation of a multiple regression equation with a multiplicative term in conditional terms reveals all these criticisms to be unfounded. In fact, it is better analytic strategy to include a multiplicative term than to exclude one.

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