SPSS provides an easier option for dummy coding in the General Linear Model (GLM) function when compared to the regression menu.
I am just wondering what should I do to perform hierarchical regression in GLM?
Should I just choose Sum of Squares Type 1.
My analysis involves one dependent variable, one categorical variable (factor) and one continuous predictor (covariate).
I am interested in the main effect as well as any interaction.
Many thanks in advance for any assistance.
In response to the comment below, I propose to enter the following in the GLM window:
- Enter the continuous DV
- Enter the continuous IV as covariate
- Enter the categorical IV as factor
- Enter the product term (factor * covariate)
- Select Sum of Squares 1 because of unequal sample size for the factor
As stated above, my goal is to ascertain the main effect of the covariate on the DV, as well as the interaction between the covariate and factor on the DV.