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Regression exp(b) spss 239/23/2023 If a variable has more than two levels and you want to use a category other than the first or the last as the reference category, you'd have to paste the command from the dialogs and add the sequential number of the desired category to the CONTRAST subcommand for that predictor variable. ![]() As long as the variables of interest are binary or the contrasts you want use either the first or last level of the variables as the reference category in forming the contrasts, you can specify them in that dialog box in order to get what you want. If you're using the LOGISTIC REGRESSION procedure (Analyze>Regression>Binary Logistic in the menus), clicking on the Categorical button will allow you to specify predictor variables as categorical and the desired type of contrast coding for each one.
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