Hi,

I want to do some clipping of statistic data sets using F- and t-score thresholds. If possible, I'd like to identify the clipping threshold on the fly from the degrees-of-freedom (DOF) information in the .HEAD file.

I could identify the t-score threshold by using a Microsoft EXCEL function like tinv (t-inverse) or finv (F-inverse) with the p-value and the DOF(s), but I can't automate that process.

I don't see a F-inverse or t-inverse function for 3dcalc in the documentation. Is there is a method anyone knows of in AFNI or UNIX (or something else) or a combination approach that would give me the F or t score for a p-value based on the degress of freedom?

Thanks for any information,

-jim