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What are adjusted P values?

April 26, 2017Adjusted p values

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What are adjusted P values?

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SAS (as part of the PROC MULTTEST statement) reports adjusted P values with multiple comparison post tests, and these are explained in the book by Westfall (citation below). Wright defines these adjusted P values and argues for their widespread use (S.P. Wright. Adjusted P-values for simultaneous inference. Biometrics 48:1005-1013,1992). It might help to compare the definition of an adjusted P value to a P value from a single comparison.