Hi NBS Experts,

I had a question regarding contrasts in my study design. My study includes three groups: HC, PR, SCZ and the covariate is age. My abbreviated design matrix is:

1  1  0  21
1  1  0  22
1  1  0  24
1  1  0  20
...
1  0  1  17
1  0  1  16
1  0  1  18
1  0  1  21
...
1  0  0  22
1  0  0  22
1  0  0  18
1  0  0  24
...

To examine an overall difference among groups would my contrast be [0 1 1 0]? And how would I write the contrasts to compare HC > SCZ, HC > PR, PR > SCZ?

Thank you,

Jessica