Re: [Freesurfer] Problem with covariates in design for surface based analysis

2012-02-27 Thread Douglas N Greve
Just to clarify, you can do this analysis in FS, but not in QDEC. You'll have to create an FSGD file. Do a search for FSGD on our wiki to get examples that you can generalize from. doug MCLAREN, Donald wrote: Charlotte, There is no difference, from a statistical perspective, of nuisance

Re: [Freesurfer] Problem with covariates in design for surface based analysis

2012-02-24 Thread MCLAREN, Donald
Charlotte, There is no difference, from a statistical perspective, of nuisance factors and covariates. The key questions are: (1) Do any of these covariates have a differential effect on thickness between groups? (2) Do you want to compare the actual group means or the covariate-adjusted group

[Freesurfer] Problem with covariates in design for surface based analysis

2012-02-23 Thread Charlotte Bernard
Dear Freesurfur users, I have a question about the design for a surface based analysis! I want to compare controls and patients. I have 5 covariates. One is a continous variable. The others are categorial variables (4 with 2 levels and 1 with 5 levels). I want to ajust my result with all of