Create dummy variables from an existing categorical variable in SPSS HD

18.09.2015
If you want to use a nominal or ordinal variable with 3 or more categories in linear regression you first need to dummy code the variable. This is because independent variables in linear regression must be either scale or dichotomous. Dichotomous just means the variable is categorical with only 2 categories (e.g., Male/Female, Yes/No, etc.)

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