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Dear Lucas, AFAIK, you cannot convert a z-map to FWE-p-map; but if your goal is to threshold your z-map with FWE, then you can calculate the z(p=0.05 FWE) threshold with ptoz command with using the -g switch. Bests, Auer, Tibor M.D. Ph.D. Biomedizinische NMR Forschungs GmbH am Max-Planck Institut für Biophysikalische Chemie Am Fassberg 11 37077 Göttingen Germany Phone/Work: +49-(0)551-201-1725 Phone/Home: +49-(0)551-387-0076 Mobile: +49-(0)176-8012-7921 Mail: [log in to unmask] 2010.09.14. 12:32 keltezéssel, Lucas Eggert írta: > Dear Experts! > > How can I determine the FWE-corrected p-Value for a given Z-value? > > I tried > > fslmaths zstat1.nii.gz -cpval fwe-corrected.nii.gz > > ... but that results in an image with only values of 1 in every voxel. > > Best wishes, > -Lucas >