Dear FSL experts,
I'm analysing DTI data from 03 different groups of subjects (healthy controls, patients and at-risk subjects), and I want to run an ANCOVA looking for differences between means with age and gender as covariates. I’ve read all the instructions provided on GLM's webpage as well as look for similar posts in JISCMail. However, I’m still not sure if the design I've made is correct.
As an example of what I’m planning to do, I’ve created the design that follows below using "Glm_gui". EV4 and 5 are demeaned age and gender. To create this, I’ve followed the design example “ANOVA: 1-factor 4-levels” found in GLM’s wiki using the “cells mean model” and adding the covariates following other examples I've found in the manual and JISCMail.
Could you guys please give me some guidance on this? Are these contrast and matrix correct? Any help would be appreciated.
MAT:
/NumWaves 5
/NumPoints 9
/PPheights 1.000000e+00 1.000000e+00 1.000000e+00 1.700000e+01 1.000000e+00
/Matrix
1.000000e+00 0.000000e+00 0.000000e+00 -4.220000e+00 -6.700000e-01
1.000000e+00 0.000000e+00 0.000000e+00 -3.220000e+00 3.300000e-01
1.000000e+00 0.000000e+00 0.000000e+00 -1.220000e+00 3.300000e-01
0.000000e+00 1.000000e+00 0.000000e+00 4.780000e+00 3.300000e-01
0.000000e+00 1.000000e+00 0.000000e+00 1.278000e+01 3.300000e-01
0.000000e+00 1.000000e+00 0.000000e+00 -1.220000e+00 -6.700000e-01
0.000000e+00 0.000000e+00 1.000000e+00 -3.220000e+00 3.300000e-01
0.000000e+00 0.000000e+00 1.000000e+00 -4.220000e+00 -6.700000e-01
0.000000e+00 0.000000e+00 1.000000e+00 -2.200000e-01 3.300000e-01
CON:
/ContrastName1 B-A
/ContrastName2 C-A
/NumWaves 5
/NumContrasts 2
/PPheights 7.786885e-01 1.029287e+00
/RequiredEffect 57.339 47.102
/Matrix
-1.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
-1.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
FTS:
/NumWaves 2
/NumContrasts 1
/Matrix
1 1
Thank you in advance,
Mauricio
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