[R] [R-pkgs] R Package: ssanv - Sample size adjustments for nonadherence and variability of input parameters

[Fay, Michael (NIH/NIAID) [E]]

Hi,

This is a late announcement for a package that has been up on CRAN since Feb 2006. 

The package is called ssanv and it calculates sample sizes for two group tests with adjustments for nonadherence and variability of the input parameters. As an example, suppose you want a sample size for a two group difference in normal means but you get your estimate of your variance from a previous study. Then with this package, you can account for the variability of that variance estimate in your sample size calculations. The details are described in:



		Fay, MP, Halloran, ME, Follmann, DA. Accounting for Variability in Sample Size Estimation with Applications to Nonadherence and Estimation of Variance and Effect Size. Biometrics 2007, 63: 465-474. http://www.blackwell-synergy.com/doi/abs/10.1111/j.1541-0420.2006.00703.x


Please let me know of any problems with the package or have any comments.

Thanks, 


Mike



******************************************************************
Michael P. Fay, PhD
Mathematical Statistician
National Institute of Allergy and Infectious Diseases
Tel: 301-451-5124               Fax:301-480-0912
(U.S. postal mail address)                           
6700B Rockledge Drive MSC 7609
Bethesda, MD 20892-7609
(Overnight mail address)
6700-A Rockledge Drive, Room 5133
Bethesda, MD 20817
**********************************************************************

Disclaimer: 

The information in this e-mail and any of its attachments is confidential and may contain sensitive information. It should not be used by anyone who is not the original intended recipient. If you have received this e-mail in error please inform the sender and delete it from your mailbox or any other storage devices. National Institute of Allergy and Infectious Diseases shall not accept liability for any statements made that are sender's own and not expressly made on behalf of the NIAID by one of its representatives



	[[alternative HTML version deleted]]

_______________________________________________
R-packages mailing list
R-packages at stat.math.ethz.ch
https://stat.ethz.ch/mailman/listinfo/r-packages