Dear All,
In an ANOVA, does anyone know when one should correct for the number
of post-hoc tests you are doing following the F-test?
It seems that doing it different ways produces different results:
(1) Modify the T-statistic, so it produces the corrected p-value
(Tukey/Bonferonni)?
(2) Divide you voxel-wise p-value by the number of tests or other
correction factor (Tukey/Bonferonni)?
(3) Use uncorrected voxel p-values, but correct the cluster p-values
for the number of tests or other correction factor (Tukey/Bonferonni)?
(4) Ignore the number of tests that you are doing post-hoc (LSD approach)?
Any thoughts would be appreciated.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Office: (773) 406-2464
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