since nobody answered the question I posted last Friday, I try again:
I am trying to do an unpaired two sample t-test comparing grey matter
volumes of mci patients with that of healthy controls. Segmentation was done
using the vbm5 toolbox provided by Christian Gaser.
In the "specify files" command, I entered the segmented grey matter volumes
(m0wc1anatomy_HMRF.nii) of each group. I selected "absolute threshold
masking" and tried to enter a value of 0.05. The default value is 100. I
could not change that value. When I try to do the stats, I get an error
message: "no inmask voxels".
What did I do wrong? Why isn`t it possible for me to set a threshold ?
I would greatly appreciate your help
Brain Imaging Center Frankfurt am Main