Dear Fsl Group,
I have a 2x2 (time x condition) within subject design.
The time factor has two levels: pre and post
The condition factor has two levels: Drug and Neutral
In addition i also have two additional covariates
which i want to adjust for.
These are : age and
Number of days since last use.
To test for interaction effects,
I set up a standard 2x2 repeated measures design.
In the above design i would like to adjust for the additional covariates.
Even though i am removing subject specific effects, is this
adjustment possible in GLM? i did set up something similar
while setting up paired T test as shown below based on some of the earlier posts i read.
To adjust for age and Duration since last use, i demeaned the covariates, multipled them with the
first EV and then entered them in the model as shown below (attached Design_paired). is this setup
right for looking at Pre vs Post effect adjusting for age and days since last use?
EV1 EV2-EV5 EV6:Pre EV7:Post EV8:Age
-1 1.. 45.75 0 -3.25
-1 0.. -38.25 0 2.75
-1 0.. 25.75 0 0.75
-1 0.. -33.25 0 -0.25
1 1.. 0 44.5 3.25
1 0.. 0 -39.5 -2.75
1 0.. 0 29.5 -0.75
1 0.. 0 -34.5 0.25
thanks in advance
Kosha Ruparel
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