afni.nimh.nih.gov

OK, I didn't notice the following sentence of yours:

> Is there a way to get the one-sided upper tail p-value?

Then do this:

3dcalc -a stats.Imagination001_REML+orig'[4]' -expr 'ispositive(-a)*(1-fitt_t2p(a,20)/2)+ispositive(a)*fitt_t2p(a,20)/2' -datum float -prefix brick4p_one_sided

Gang