[R] post hoc statistical power

[Charles C. Berry]

On Tue, 8 Apr 2008, Yuelin Li wrote:

> I remember reading about post hoc statistical power on R-help.  But I
> can't seem to find them with RSiteSearch("post hoc statistical power")
> and variations of it.
>
> I would like to learn more about post hoc statistical power, its
> meaningfulness, advantages and disadvantages.  I thought the issue was
> settled after Tukey's 1993 paper about post hoc statistical power
> being "essentially meaningless once the experiment has been done".
> But they seem to be used, and sometimes encouraged
> (e.g., http://www.informaworld.com/smpp/content~content=a787469931).
>
> I do not intend to start a debate.  I simply would like to learn
> more.  Can anyone suggest a few articles?  Thanks,

Start here:

Hoenig, John M. and Heisey, Dennis M. (2001)
The abuse of power: The pervasive fallacy of power calculations for data 
analysis
The American Statistician, 55, 19-24
Keywords: bioequivalence testing; BURDEN OF PROOF; OBSERVED POWER; 
RETROSPECTIVE POWER ANALYSIS; statistical power; Type II error
CISid: 222509

HTH,

Chuck


>
> Yuelin.
>
> Tukey JW. Tightening the clinical trial. Control Clin Trials. 1993;14:266-285.
>
>
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901