These are examples that have been worked out by creating FreeSurfer Grou Descriptor (FSGD) files and contrasts for testing various hypotheses. These are not meant to be exhaustive, nor is it meant to teach you statistics.
For information about the FSGD format, see here. For a review of DODS and DOSS, see here. You can find slides on more of the theory of group analysis and how it applies to FreeSurfer here.
One Group, Zero Covariates (OSGM = One-Sample Group Mean). DODS or DOSS
Two Groups (1 Factor, Two Levels), Zero Covariates. DODS or DOSS
Two Groups (1 Factor, Two Levels), One Covariate. DODS only.
Two Groups (1 Factor, Two Levels), Two Covariates. DODS only.
Three Groups (1 Factor, Three Levels), Zero Covariates. DODS or DOSS.
Four Groups (2 Factors, Two Levels), Zero Covariates. DODS or DOSS.
Four Groups (2 Factors, Two Levels), One Covariate. DODS only.
Six Groups (2 Factors, Three Levels), Zero Covariate. DODS or DOSS.