Multivariate Power Test?

Generic question... I am familiar with generic power calculations in R,
however a lot of the data I primarily work with is multivariate.  Is there
any package/function that you would recommend to conduct such power
analysis?  Any recommendations would be appreciated.

Thank you for your time,

Charles

Are you referring to a multivariate response or a multivariable model? Just trying to parse the terminology better.

If the former, I don't believe that there is anything in R, but could be wrong. If correct, then you might want to look at simulation.

If the latter, you might want to look at the Clinical Trials Task View:

  http://cran.r-project.org/web/views/ClinicalTrials.html

as there are various packages that might fit what you need, but again, simulation is always an option.

Regards,

Marc Schwartz

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Generic question... I am familiar with generic power calculations in R,
however a lot of the data I primarily work with is multivariate.  Is there
any package/function that you would recommend to conduct such power
analysis?  Any recommendations would be appreciated.

Thank you for your time,

I don't know an R implementation, but the theory of multivariate power 
analysis is well worked out and implemented in SAS/IML.

See POWERLIB, described in
http://www.jstatsoft.org/v30/i05

HTH
-Michael

Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA