Hi Sandra, you cannot do the longitudinal statistical analysis in QDEC. You will have to use mri_glmfit. Look at the FSGD examples on the wiki. doug
On 06/28/2013 03:28 AM, Sandra Preissler wrote:
Dear freesurfer experts,
we want to do longitudinal analyses for two different time points in only one group (We do not have a control group or different groups within the intervention). So we did the longitudinal processing as described in the tutorial (http://ftp.nmr.mgh.harvard.edu/fswiki/FsTutorial/LongitudinalTutorial#Prepar...). Now we tried to investigate the results with Qdec. We wanted to test whether the averaged change of thickness between pre-test and post-test differs from zero. We had the experience that we could only test the averaged thickness by choosing a discrete factor in Qdec. Our Problem is that we don’t have a control group. So we couldn't choose the group variable as discrete factor. It’s an pre-post-design with only one group.
Is it possible to investigate changes in thickness between pre-test and post-test without choosing a factor? Or do we have to create a group variable as discrete factor?
Can you help us in fixing this problem?
Thanks in advance!
Sandra
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