Re: [Freesurfer] Cluster correction for multiple comparisons using mri_glmfit-sim

MC-Z will be independent of the number subjects. The z simulation assumes an infinite DOF.

doug

Devdutta W wrote:

Here is the command line I am using. the same one was used both times; only the glmdir was different.

mri_glmfit-sim \ --glmdir /data/zonda1/freesurfer_subjects/qdec/rh.area \ --sim mc-z 5000 2 mc-z.abs.2 \ --sim-sign abs \ --overwrite

On Wed, Jul 22, 2009 at 12:43 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:

What are your command lines? In general, it's a good idea to send
this each time, even if you're not sure it's useful.

doug

Devdutta W wrote:

    Hi,
    I just ran the mri_glmfit-sim command on our data and there
    were a couple of things I did not understand. We had
    previously ran the same command on fewer subjects and it had
    taken about 10 days to run.  This time around it only took 2
    days even though we had more subjects (there don't seem to be
    any errors; it just finished sooner).
    Another thing I noticed was that previously the command wrote
    several folders (ones that measured thickness, sulc, area,
    etc. both average and difference between the subject groups)
    into the output folder we specified in the "glmdir" option.
     This time it only wrote one (just the average thickness).

    As far as I can tell, I followed the command exactly as before
    (copied and pasted the command) with the same number of
    interations.  I also followed the Group Analysis tutorial from
    the wiki.
    Can anybody shed some light on this?  Why this discrepancy
    between the two?

    Thank you,
    Devdutta
    ------------------------------------------------------------------------

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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
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