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Use of Dummy Variables in Regression Equations

Daniel B. Suits
Journal of the American Statistical Association
Vol. 52, No. 280 (Dec., 1957), pp. 548-551
DOI: 10.2307/2281705
Stable URL: http://www.jstor.org/stable/2281705
Page Count: 4
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Use of Dummy Variables in Regression Equations
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Abstract

The use of dummy variables requires the imposition of additional constraints on the parameters of regression equations if determinate estimates are to be obtained. Among the possible constraints the most useful are (a) to set the constant term of the equation to zero, or (b) to omit one of the dummy variables from the equation. In working with a single system of classes either constraint can be used, and results from the application of one are readily derived from those obtained from the other. If several systems of classes are involved the best procedure is to delete one dummy variable from each system.

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