Dear FreeSurfer experts,
I am trying to analyze some single time points of my longitudinal data in QDEC. I have 3 groups and created a file for the discrete factor "group" with three levels (1,2 and 3). I have done the same for gender (with 2 levels). The analysis with gender works just fine but when I try to use group as a factor I get an error message that factor 1 must have 2 levels:
SUBJECTS_DIR is '/scr/etsch2/kids/ct' ERROR: QdecGlmDesign::GenerateContrasts: factor 1 must have 2 levels ninputs = 72 Checking inputs nframestot = 72 Allocing output Done allocing nframes = 72 Writing to /scr/etsch2/kids/ct/qdec/lh.thick10_groupdiffsc1/y.mgh gdfReadHeader: reading /scr/etsch2/kids/ct/qdec/lh.thick10_groupdiffsc1/qdec.fsgd INFO: gd2mtx_method is dods Reading source surface /scr/etsch2/kids/ct/87kids_template/surf/lh.white ERROR: no contrasts specified. Error in Analyze: command failed: mri_glmfit --y /scr/etsch2/kids/ct/qdec/lh.thick10_groupdiffsc1/y.mgh --fsgd /scr/etsch2/kids/ct/qdec/lh.thick10_groupdiffsc1/qdec.fsgd dods --glmdir /scr/etsch2/kids/ct/qdec/lh.thick10_groupdiffsc1 --surf 87kids_template lh
In the tutorial it doesn't state that QDEC has to have discrete factors with 2 levels only. Am I doing something wrong or is there a work-around for that maybe?
Cheers, Clara