Using every level of a categorical array in a regression

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Martin
Martin 2015-8-12
回答： Tom Lane 2015-9-12
I am trying to run a regression, where instead of a constant term I would like to include every level of a categorical array. I know, that the results will be numerically the same either way, the main reason why I want to do this is convenience (it is part of a larger estimation procedure).
I would like to ask You if there is a way to do it when estimating a GLM model.
Thanks in advance,
Martin

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回答（1 个）

Tom Lane
Tom Lane 2015-9-12
You could try using the DUMMYVAR function to generate indicator variables for each of your categories, then omit the constant term. If you supply the categorical variable directly as a predictor, MATLAB always omits one of the categories.

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