[MINC-users] mni.cortical.statistics help

[Mishkin Derakhshan]

Hi,
I am using a simple glim file which contains
filename,group
but my group has three categories (group1,group2,group3).

After running y~group here:
vs <- mni.vertex.statistics(gf, 'y ~ group', vertex.table=dt)

I look at the vertstats file and I have the following tstatistics:
tstatistic.group1
tstatistic.group2
tstatistic.intercept

What do these mean though? ie
Does tstatistic.group1 =
group1 vs (group2+group3) ?
group1 vs group2 ?
group1 vs group3?

Is there a way to control the comparisons, or do i have to make
separate glim files with a max of two groups in them?

Ideally I would like to see
group1 vs group 2
group1 vs group 3
group 1 vs group2+group3

thanks,
mishkin