Re: [Freesurfer] Confused results from Qdec

2013-07-15 Thread Douglas N Greve
Hi Wayne, this is the problem with these types of corrections. As you change the parameters, the null distribution for cluster sizes change. At a threshold of .01 you may get a cluster that is smaller than at .05, but it may be more significant because the shape of the null distribution change

[Freesurfer] Confused results from Qdec

2013-07-15 Thread Wayne Su
Dear Freesurfers, I used Qdec to do two-group comparison on cortical thickness. Demeaned age was used as the covariate. The question I¹m looking at is that ³Does the thickness-age correlation differ between C1 and C3?² When FWHM=15mm was chosen, I got confused results: When I used threshold 1.3(