Hello,
I have a question about 3dROIstats.
I used 3dROIstats to get beta values within a ROI (162 voxels) for two groups, then I run an independent two sample t test and got a t-vaule of 2.0881 ( mean of Group A = 0.117, mean of Group B = 0.057, df =30 )
However, when I run a 3dttest++ for these two groups, I got a different t-values of 1.839 within this ROI (mean of Group A = 0.095, mean of Group B = 0.045, df =30 )
I double checked my script and checked the mean and t in each individual subjects within this ROI, it looks like that beta vaule from each subject using 3dROIstats is a little bit higher.
I am wondering why these results don't match.
Thank you.
Kai
