Posted by jian on March 24, 2001 at 20:14:45:
Hi. here is my questions:
I want compare two conditions, which is scanned in different functional runs and have different time point. Run for condition A have 96 points, functional run for condition b have 128 points, for each condition in one session for one subject we have four runs. I concatenate them into two big functional runs, one is 96*4=384 time points, another conditon is 128*4=512 time point, I used ttest and 3dWilcoxon to see the difference between the two conditions, the ttest result is reasonable, the 3dWilcoxon test looks like strange, because when I change the slide bar to see the result, all activation voxol dissappeared at certain threshrould value and is not a gradual process. My command is like the following:
~kongj/afni/3dWilcoxon \
-dset 1 'sub1_a@1+tlrc[0]' \
-dset 1 'sub2_a@1+tlrc[0]' \
-dset 1 'sub3_a@1+tlrc[0]' \
-dset 2 'sub1_b@1+tlrc[0]' \
-dset 2 'sub2_b@1+tlrc[0]' \
-dset 2 'sub3_b@1+tlrc[0]' \
-voxel 1234567\
-out Wilc_aVsb
I wonder if I do something wrong, may I use ttest to test difference between the two conditions.
Thanks
jian