Hi
refering to
http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/DesignMatrix Design Matrices with DOSS and DODS I want to make an analysis of same offset different slope between classes with a continuous age variable
If I was doing this with the example( 3 variables )
starting with for dods 1 0 10 0 100 0 1000 0 1 0 15 0 150 0 1500 0 0 1 0 20 0 200 0 2000 0 1 0 25 0 250 0 2500
I would change to for same offset different slope 1 10 0 100 0 1000 0 1 15 0 150 0 1500 0 1 0 20 0 200 0 2000 1 0 25 0 250 0 2500
for my example with 2 classes and one variable, age I would have.. for same offset different slope
a contrast vector [ 0 1 -1] in file sodsage.mat --direct comparison between thickness and age between class
and do glm_fit with my design in file Xgsods.dat
matrix of the form, 4 subj for brevity
1 n1 0 1 n2 0 1 0 n3 1 0 n4
mri_glmfit --y lh.sickle.thickness.10.mgh --glmdir lh.sickle_sodsage.glmdir
--surf SICKLECELLAVE lh --C sodsage.mat --X Xgsods.dat
did I get it correct ?
thanks
Greg.