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Predictor (common alternate for independent variable that softens the causal language. ) Carrier (mostly in the regression diagnostic literature) X variable (due to common notation) Covariate (strictly speaking this applies to variables that are observed not manipulated)
3.1 Regression with a 0/1 variable. The simplest example of a categorical predictor in a regression analysis is a 0/1 variable, also called a dummy variable or sometimes an indicator variable. Let's use the variable yr_rnd as an example of a dummy variable.We can include a dummy variable as a predictor in a regression analysis as shown below..2 Regression with a 1/2 variable. A categorical predictor variable does not have to be coded 0/1 to be used in a regression model. It is easier to understand and interpret the results from a model with dummy variables, but the results from a variable coded 1/2 yield essentially the same results.