If you have k groups, why do you only need k-1 dummy variables to represent group membership?

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If you have k groups, why do you only need k-1 dummy variables to represent group membership? Why is it impossible to include k dummy variable as predictors in a regression when you have k groups?

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Applied Statistics From Bivariate Through Multivariate Techniques

ISBN: 9781412991346

2nd Edition

Authors: Rebecca M. Warner

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Question Posted: Nov 20, 2015 01:32 AM

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If you have k groups, why do you only need k-1 dummy variables to represent group membership?

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If you included a k th group the responses on this k th dummy variable would be perfectly predict...View the full answer

Applied Statistics From Bivariate Through Multivariate Techniques

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