Hi Doug, I asked you about how to perform group analysis on maps created using an index I calculated. You suggested using mri_concat to concatenate the maps and then perform the analysis using mri_glmfit. I then asked about NaN values in the maps and how freesurfer treat these values. You said "It will probably crash. I does nothing to find NaNs and handle them in an appropraite way"
When concatenating maps with NaN values, the following lines are printed out in the terminal:
*Invalid argument*
*WARNING: #number NaNs found in subjid.map.mgh* but it creates the concatenated mgh file. However, if maps from all subjects contain NaN values, it does not create the corresponding mgh file. My question is: Does it mean that it discards subjects with NaN values??
Ladan