afni.nimh.nih.gov

Hi Prerona,

> I just wanted to ask what is the number 3.1 in the command
> 3dclust -1Dformat -nosum -1dindex 10 -1tindex 11 -2thresh ? ? -dxyz=3 3.1 X

The number 3.1 is meant to provide a distance that is slightly bigger than a value per the neighborhood definition (NN1: face touching in the above example) so that 3dclust can use it as a criterion and search for surviving clusters.

> Also, can -1dindex & -1tindex be same (as in an F test)

It's reasonable in the case of F-statistic.

Gang