From:    Dan Gruner 
Subject: power analysis software: digest

Hello again,

Below you will find a digest of responses to my request for information on
power analysis software and shareware.  A couple of the links seem very
useful as they provide links to the software providers.  These you will
find as the first two entries in this digest.  A big thanks to all those
who responded!

Dan
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A comprehensive list of power analysis software for microcomputers
This page is an attempt to provide an up-to-date list of microcomputer
software that can be used to calculate the power of statistical hypothesis
tests. It is maintained by Alejandro Escalante,

http://www.insp.mx/dinf/stat_list.htmlnts/s-archive/
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It has links to the following series of programs that do power
analysis, so you can download many of the programs. Some of these are
freeware/shareware, while others are commercial (some very expensive).
It gives the hardare requirements, who to contact, and that sort of
thing. Hope this helps.

http://www.interchg.ubc.ca/cacb/power/nts/s-archive/

     CRCSSIZ
     Datasim
     Design Power
     ECHIP
     Egret SIZ
     EpiInfo
     Ex-Sample and Ex-Sample +
     GAUSS
     GLIM
     G*POWER
     Hyperstat
     JMP
     MacAnova
     MONITOR
     Microsoft Excel
     MODSTAT
     MSUstat
     N
     NCSS
     NCSS-CALC
     NCSS-PASS
     NONCDIST and SMPLSIZE
     nQuery advisor
     NSurv
     PC-SIZE and SIZE
     Power
     Power & Effect
     Power and Precision
     POWER.FOR
     PowerPack
     PowerPlant
     POWPAL
     Precision of survival studies
     PS
     R2
     Sample Power
     SAS
     SHAZAM
     Sigmastat
     SIMSTAT
     S-PLUS
     SPSS
     SOLO Power analysis
     SSIZE
     SST
     STATGRAPHICS Plus
     Statistica
     Statistical power analysis
     StatMate
     STAT-POWER
     Stats
     STPLAN
     Stata
     SYSTAT Design
     TRENDS
     True EPISTAT
     XLISP-STAT
     wdist
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There is a good and free of charge program, G*Power available at
http://www.psychologie.uni-trier.de:8000/projects/gpower.html
---------------------
S-plus does power analyses for a number of different experimental designs.
You'll have to check and see if it works for your design, but I suspect it
will.
-------------------
I have used Monitor which I got off the Web from a USFWS website quite
simple and user friendly.
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If your experimental design will fit the framework of ANOVA or general
linear models, and if you use SAS for your data analysis, there are a
couple of options in SAS.  There are at least 2 sets of macros available
from SAS Institute's web server (and probably included in the sample
library on the cd-rom) that perform moderately sophisticated power
analyses.  There is also proc PLAN for generating complex designs,
although I haven't used it.  They also have code for setting up lattice
designs, but that's not usually a question of statistical power.
--------------------
JMP (a SAS product) conducts power analyses and is available for the MAC,
and I believe for PCs.
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See Thomas, L. and C.J. Krebs. 1997.  A review of statistical power analysis
software.  Bulletin of the Ecological Society of America 78(2): 128-139.  See
also the following web address for a list of power analysis software  (you
can
even download a reprint of the review)
-----------------
SigmaStat (SPSS Inc.)provides power and sample size analysis for
t-tests,proportions,ANOVA,chi-square,and correlation.
---------------
This probably isn't what you had in mind, but JMP (JuMP), a windows-based
package put out by the SAS institute can calculate power for a variety of
experimental designs.  You can vary all the parameters in any combination and
get a complete list of power levels for all combinations entered.

JMP is a general stats package so it may cost more than you had in mind for
something just to do power analysis.  I don't know the cost as I have only
used
a demo copy.
-----------------------
i've used a very nice package called Power and Precision.  it is
available for windows, at least.  they have a webpage, although i don't
have the URL handy at the moment; try searching "power and precision".
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Minitab v.11 or the newest is 12.  Try, info@minitab.com &
http://www.minitab.com/.ni-trier.de:8000/projects/gpower.html  This is the MOST complete statistical software I
have seen and I have worked as a consultant for three years and have
recently attained a v.11 release for my home use.  Not free, but nothing
truely worth having is free of investment :).
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