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Review
. 1991;1(1):133-8.
doi: 10.1080/10543409108835010.

One-sided or two-sided p values: which most appropriately address the question of drug efficacy?

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Review

One-sided or two-sided p values: which most appropriately address the question of drug efficacy?

K E Peace. J Biopharm Stat. 1991.

Abstract

Whether a one-sided or a two-sided p value should be used for reporting the results of an analysis should be determined by the a priori question the investigation seeks to answer. It is concluded that one-sided p values are appropriate in clinical trials whose objective is to provide definitive, confirmatory evidence of efficacy of pharmaceutical compounds.

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