Significance Testing

Gabriel A. Eickhoff eickhoff at UMICH.EDU
Thu Jun 14 02:47:49 CDT 2001

Actually, let me re-phrase these questions a little bit more clearly and

Why do we use significance (P values like: P>.01) ?

What does it really tell us that using confidence intervals don't?

Why, in biological papers mainly having to do with experiments, don't we
incorporate a consideration for "power", i.e. calculate for sample size and
parameter range?

At what point is a sample size "good"?


Gabriel A. Eickhoff
University of Michigan
Department of Eco.Evo.Organ.Biol.
Ann Arbor, Michigan

On Wed, 13 Jun 2001 19:59:31 -0500, Gabriel A. Eickhoff
<eickhoff at UMICH.EDU> wrote:
>Say, I was wondering if you all might help me out with a few questions
>I've been asking around for a paper I've been working on. It's about the
>of significance (P values), power and null-hypothesis testing in Biological
>papers. How often do you run across publications that use significance
>values like (P>.05) or (P=.01). Often, rarely? What do you make of papers
>that rely for the most part on null-hypothesis testing and don't use any
>statistical theory?

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