"Robert J. MacG. Dawson" wrote:
>
> > Alan McLean wrote:
> The p value is a direct measure of 'strength of evidence'.
>
> and Lise DeShea responded:
> >
> > I disagree. The p-value may be small when a
> > study has enormous power yet a small effect size.
> A p-value by itself doesn't say much.
>
> I don't think there's actually a contradiction
> here, provided that "strenth of evidence" [against the
> null hypothesis] is not misunderstood to mean
> "strength of evidence for the conclusion you are
> trying to draw", this latter rarely being the literal
> denial of the null hypothesis.
>
> -Robert Dawson
There is certainly no contradiction. A small p value indicates that the
effect (whatever its size!) is (probably) valid. (Use the word 'genuine'
if you prefer.)
The effect may be too small to be of much use, but that is a very
different question.
Alan
--
Alan McLean ([EMAIL PROTECTED])
Department of Econometrics and Business Statistics
Monash University, Caulfield Campus, Melbourne
Tel: +61 03 9903 2102 Fax: +61 03 9903 2007
=================================================================
Instructions for joining and leaving this list and remarks about
the problem of INAPPROPRIATE MESSAGES are available at
http://jse.stat.ncsu.edu/
=================================================================
