Myriam,
Since the residuals at the group level currently cannot be obtained through from 3dMEMA (the option -residual_Z only provides the Z-stat for the residuals), I was suggesting that you estimate the ACF using the residuals from the individual subject analysis from 3dDeconvolve or 3dREMLfit. Specifically, when you perform individual subject analysis, there is an option -errts in 3dDeconvolve that provides the residuals for each subject. Then you run 3dFWHMx with the output from the option -errts in 3dDeconvolve, and the ACF estimates should not vary too much across subjects. You can use the average ACF values to get the cluster thresholds with 3dClustSim. Does this make sense?
Gang
Edited 1 time(s). Last edit at 10/25/2017 09:09PM by Gang.