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Topic: p-value < alpha, correct to reject the Null!
Replies: 2   Last Post: Nov 12, 2012 6:47 PM

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Luis A. Afonso

Posts: 4,615
From: LIsbon (Portugal)
Registered: 2/16/05
Re: p-value < alpha, correct to reject the Null!
Posted: Nov 12, 2012 6:47 PM
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When I had found (this Sunday) the notion of p-value together with Plausibility [1] I could hardly contain my joy, because the last current definition:
____In statistical hypothesis testing, the p-value is the probability of obtaining a test statistic at least as extreme as the one that was actually observed, assuming that the null hypothesis is true____(Wiki)
,can be cautiously read: *at least as extreme as the one that was actually observed* means really that it?s not impossible to find a larger p-value even that null is true.
Plausible states (for me) the exact situation: under null hypotheses true it is more and more unexpected that one get a larger p-value and if it happens by chance we reject H0 as unlike. Of course we has the probability alpha to be wrong (type I error): bad luck to test an *abnormal* data, for example, sample from z~N(0,1) where z >2.

Luis A. Afonso

[1] Ryan Martin, Chuanhai Liu, (Nov. 12, 2012) On a *plausible* interpretation of p-values.
arxiv.org/pdf/1211.1547 - -



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