[R] post hoc statistical power

Charles C. Berry cberry at tajo.ucsd.edu
Tue Apr 8 18:57:54 CEST 2008

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 
The American Statistician, 55, 19-24
Keywords: bioequivalence testing; BURDEN OF PROOF; OBSERVED POWER; 
RETROSPECTIVE POWER ANALYSIS; statistical power; Type II error
CISid: 222509



> Yuelin.
> Tukey JW. Tightening the clinical trial. Control Clin Trials. 1993;14:266-285.
>     =====================================================================
>     Please note that this e-mail and any files transmitted with it may be
>     privileged, confidential, and protected from disclosure under
>     applicable law. If the reader of this message is not the intended
>     recipient, or an employee or agent responsible for delivering this
>     message to the intended recipient, you are hereby notified that any
>     reading, dissemination, distribution, copying, or other use of this
>     communication or any of its attachments is strictly prohibited.  If
>     you have received this communication in error, please notify the
>     sender immediately by replying to this message and deleting this
>     message, any attachments, and all copies and backups from your
>     computer.
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

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

More information about the R-help mailing list