Hi experts,

I am not sure if this has already been addressed in FS discussion.

If my fsgd file looks like following:

Class Male

Class Female

Variables Performance Age

Input S1 Male 181 25

Input S2 Female 167 23

....

I understand that the contrast matrix [0 0 1 -1 0 0] represents whether there is a difference between the group (male/female)-performance slopes regressing out the effect of age. In other words, this matrix calculates whether two slopes i.e. one for males: thickness-performance slope and second for females: thickness-performance slope - are significantly different after regressing out the effect of age.

My questions are following:

(1) Is my above interpretation of contrast matrix [0 0 1 -1 0 0] correct?

(2) If my interpretation is correct, then I was wondering what will be the contrast matrix if I want to check whether there is significant effect of age on e.g. thickness-performance slopes after regressing out the effect of gender. And what will be the corresponding fsgd file for that, any changes in that?

Thanks.