Hello Experts,

I am performing an analysis looking at the relationship between amyloid uptake and cortical thickness using --pvr flag in mri_glmfit. I've 2 groups and 2 variables (age and education). I want to run a within group analysis while regressing out age and education (i.e. Within group 1, is there a negative relationship between amyloid uptake and cortical thickness regressing out the effects of age and education).

However, i'm not sure how my pvr contrasts will look like. Below are my fsgd and an attempt at creating contrasts. Please, can you let me know if my contrasts are correct based on my questions.

Thank you.

Best,
Paul

The fsgd file lists:
-------------------------------------------------------------
GroupDescriptorFile 1
Title Relationship Amy-thick reg out age and education
Class g1
Class g2

Variable Age Education
Input XX1 g1 60 16
Input XX2 g1 58 14

Input YY1 g2 62 20

Input YY1 g2 62 20

-------------------------------------------------------------

matrix for group1:

pvrgroup1= 1 0 0 0 0 0 0

is there a relationship between amyloid-thickness in group1 regressing out age

and education?

matrix for group2:

pvrgroup2= 0 1 0 0 0 0 0

is there a relationship between amyloid-thickness in group2 regressing out age

and education?