Hi Trinity,

they answer different questions. Fixed effects answers questions about a specific set of subjects, but you can't generalize beyond. Random effects allows you to generalize to a population, but of course has much less power. By default none of our results are corrected, but we do have tools that will be in the upcoming release that do multiple comparison correction.

cheers, Bruce

On Thu, 2 Feb 2006 trinity@nmr.mgh.harvard.edu wrote:

Hi -

I have a question about the fixed effects and random effects analysis. Are the values from the averaged maps corrected or uncorrected? Also, which is better to use for a group comparision? Are there certain instances when one is better to use than the other?

Thank you!

Trinity _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer