Hi FreeSurfer Experts,

On this page (https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/QdecMultipleComparisons), it says: "In particular, thresholds of 1.3, 2, 2.3, 3, 3.3 and 4, corresponding to p-values of 0.05, 0.01, 0.005, 0.001, 0.0005 and 0.0001, which are common thresholds."

I am wondering how these thresholds were computed. 

In my own computation, I found z-value to be the following, but neither one-sided nor two-sided matches the thresholds of 1.3, …, 4 as shown above?

one-sided:

p-value=0.0500, z-value=1.6

p-value=0.0100, z-value=2.3

p-value=0.0050, z-value=2.6

p-value=0.0010, z-value=3.1

p-value=0.0005, z-value=3.3

p-value=0.0001, z-value=3.7

two-sided:

p-value=0.0500, z-value=2.0

p-value=0.0100, z-value=2.6

p-value=0.0050, z-value=2.8

p-value=0.0010, z-value=3.3

p-value=0.0005, z-value=3.5

p-value=0.0001, z-value=3.9

Thanks!

Daniel

-- 

Yung-Jui "Daniel" Yang, PhD

Postdoctoral Researcher

Yale Child Study Center

New Haven, CT

(203) 737-5454

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