I have a dataset that comprises 200 males and 250 females and I am testing their responses on the relationship between X and Y.
X and Y are continuous and X1 (gender) is categorical.
I am using the general linear model in SPSS to test for main effects and interaction.
As I understand it, this is an 'unbalanced' design because the size of the two groups (males and females) are not the same.
- Is using Sum of Squares (Type III) appropriate in this case?
- What alternatives do I have to analyse this data?