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I have only seen it when the moderator variable has only 2 levels/groups/categories (dichotomous). What if my moderator variable has 3 levels? Should I just use a two-way ANOVA then since it also tests interaction effects? Or can I do moderated multiple regression (multiple regression with an interaction effect) using Process by Andy F. Hayes, even if my moderator variable has 3 categories?

(Please no complicated mathematical explanations, I'm only an undegrad)

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