[R] sample size/power calc packages

John Fox jfox at mcmaster.ca
Tue Nov 11 13:55:07 CET 2003

Dear Peter,

At 12:30 PM 11/11/2003 +0100, Peter Dalgaard wrote:
>rossini at blindglobe.net (A.J. Rossini) writes:
> > For various reasons, I spent part of my time today looking at sample
> > size and power calculation tools (don't ask, don't tell...).  This
> > seems to be one area that R is incredibly weak in (well, nearly all
> > stat packages, except perhaps specialized tools and SAS); sure, there
> > are a number of functions in various packages:
> >
> >           base, statmod, Hmisc
> >
> > Have I missed something?  (I would've expected at least one sequential
> > computation, or non-standard design, but apparently there are none, or
> > I missed it).
> >
> > I'd appreciate hearing about work that I've missed...
>Is SAS particularly hot? I've just been explaining to people how to
>cheat SAS Analyst into letting the Two-Sample t-Test sample-sizer do
>binomial proportions with a fudged SD.

There is an extensive set of power-calculation macros in SAS, by Ralph 
O'Brien, at <http://www.bio.ri.ccf.org/power.html>. Apparently SAS Version 
9.1 will have new procs power and glmpower, which will cover most of what 
is in these macros.


John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox

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