Re: [Freesurfer] Brain volume covariate problem in QDEC

2011-09-16 Thread Douglas N Greve
Hi Adam, try rescaling the brain volume to be around 1 (demeaning it might help too). The next version of FS will remove these scaling problems. doug Adam David Felton wrote: > Hello, > > I am using Qdec to analyze thickness (etc) using various IVs (e.g., > Verbal IQ) while controlling for cor

[Freesurfer] Brain volume covariate problem in QDEC

2011-09-15 Thread Adam David Felton
Hello, I am using Qdec to analyze thickness (etc) using various IVs (e.g., Verbal IQ) while controlling for cortical grey matter volume (or ICV) as a nuisance factor. With the exception of the IV Sex, every time I run the analysis it goes into an endless loop, sporadically stating that the "Matri