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Hi FreeSurfer experts,
I ran a vertex wise analysis that consisted of six groups with two continuous covariates which yielded a cluster after mri_glm-fit. I've extracted the values from the ocn.dat file. I ran a post hoc analyses in matlab to determine which group is significantly different using the command below:
X = load('Group.Xg.dat'); design matrix from freesurfer C = load('C.dat'); post hoc contrast(s) Y = load('Whole.brain.cluster.dat'); values from the ocn.dat file [beta rvar] = fast_glmfit(Y,X) [F pvalues] = fast_fratio(beta,X,rvar,C)
This outputs an array of beta values where the first six would be the intercept. How would I calculate the standard error of the intercept for each group? Would it be rvar/(sqroot(n)).