Hello,

I am trying to complete the Monte Carlo Simulation (http://afni.nimh.nih.gov/sscc/gangc/mcc.html) and I have just a couple questions about the process.

1) To create the group mask, I collected all the full_mask.$subj's from afni_proc.py individual analysis, adwarped to tlrc space, and then ran:
3dmerge -gmean -prefix Group.Merge $subj.mask1 $subj.mask2 etc. ## average 40+ subjects
3dcalc -a Group.Merge -expr 'astep(a, .5)' -prefix Group.Mask ## Only Include voxels that were in 50% or more prevelant in Group Mask
3dresample -dxyz 3.75 3.75 4 -rmode 'NN' -prefix Group.Mask.EPI Group.Mask ## Make mask the size of original EPI images

Is this a correct way to make a group mask? Is there a better method to bring together 40+ subjects?

2) To obtain Spatial Correlation, I used the same mask from the individual afni_proc and the errts from the 3dDeconvlove
3dFWHMx -dset $subj.errts+orig -mask full_mask.$subj+orig -out $subj.fwhm.txt

Would this be the correct mask to use or does the mask indiciation in the instructions refer to the group mask? I thought I would use the subject's own mask because a) both errts and mask are in orig space b) the averaging step (next) would account for the group level.

3) I now have 40+ 3-column txt files from step 2. How can I average these together?
a) I am trying avoid 1deval, but in such a case can 1deval input more than 26 files (a-z) at a time? Is there anyway to indicate a batch input (i.e. "file1 file2 file3 etc")
b) I read some posts about using 3Tstat on 1D files, so I tried:
3dTstat -mean file1'[0]' file2'[0]' file3'[0]' etc. > Column0
however I got the error: Cannot Open file1'[0]'. Has there been a change to 3d-programs inputing 1D files? Did I not use the correct options?
Essentially, what would be the best/most effiecent mechanism to average MANY files together?

Thank you for your help, as always your guidance is greatly appreaciate.