Dear Dr. Yan,
Sorry to bother you some basic questions, I want to know what I will get after two-sample t-test by using ALFF, the data I uesd mALFF. Second, if I used VOI in spm to extract significant value from two-sample t-test by using ALFF, what's the value represent? Third, if I have used covariates such as gender in the two-sample t-test, after that I extracted value to do correlation, should I use partial correlation, I mean regress out gender covariates again? or only correlation?
Any helpful advice will be highly appreciated!
Best
fish
Forums
Hi Fish,
Hi Fish,
1. This is the difference of normalized ALFF (m*) between the two groups.
2. If you extracted from the m* files, that means the relative strength of ALFF of that voxel (relative to the global mean).
3. I suggest you to use a GLM model to do that. Partial correlation is equivalent to regressing out all the other covariates and then do correlation.
Best,
Chao-Gan