publication . Article . 2014

In defense ofPvalues

Paul A. Murtaugh;
Open Access
  • Published: 17 Mar 2014 Journal: Ecology, volume 95, pages 611-617 (issn: 0012-9658, Copyright policy)
  • Publisher: Wiley
Abstract
Statistical hypothesis testing has been widely criticized by ecologists in recent years. I review some of the more persistent criticisms of P values and argue that most stem from misunderstandings or incorrect interpretations, rather than from intrinsic shortcomings of the P value. I show that P values are intimately linked to confidence intervals and to differences in Akaike's information criterion (ΔAIC), two metrics that have been advocated as replacements for the P value. The choice of a threshold value of ΔAIC that breaks ties among competing models is as arbitrary as the choice of the probability of a Type I error in hypothesis testing, and several other c...
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free text keywords: Ecology, Evolution, Behavior and Systematics, p-value, Instrumental and intrinsic value, Confidence interval, Akaike information criterion, Null hypothesis, Significance testing, Mathematics, Statistical hypothesis testing, A priori and a posteriori, Statistics, Ecology
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