I confused between PROC GLM and REG, I read about the difference but still don't have the ability to answer a question like: Q: A linear model has the following characteristics: - A dependent variable (y) - Three continuous predictor variables (x1-x3) - One categorical predictor variable (c1with 3 levels) Which SAS program fits this model? My answer is C, but I the right answer is D. Why?
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