Yes, you could do each separately.
doug
On 6/16/14 8:10 PM, Tudor Popescu wrote:
Dear FS list,
I have a data set with 3 groups (2 treatments, 1 control), each with
equally-spaced time-points (pre and post structural scan). I've done
the 3 longitudinal pre-processing steps, and stage#1 of the two-stage
model, and I would prefer to run stage#2 (cross-sectional analysis of
the difference) with QDEC as opposed to with mri_glmfit.
I know that QDEC is meant for 2 groups, but I see that designs with 4
or 6 groups can be analysed with QDEC (as per this
<https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples> FSGD examples
page) whereas designs with 3 groups cannot be. It seems to me that an
even number of groups is QDEC-able while an odd number isn't, but is
there any workaround so that I can still use QDEC? Perhaps if I only
do pairwise comparisons one at a time, i.e. treatment1 vs control and
treatment2 vs control?
Many thanks!
Tudor
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