Usage Note 24556: Performing retrospective power analysis
PROC POWER, PROC GLMPOWER, and the Power and Sample Size application are designed to provide prospective power analysis and sample size computations to be used in the planning stages of an analysis. They do not include any capability to perform retrospective power or sample size computations. Retrospective analysis is not available in SAS.
The following references discuss why retrospective power analysis should be discouraged:
Hoenig, J. M., and D. M. Heisey (2001), "The abuse of power: The pervasive fallacy of power calculations for data analysis," The American Statistician, 55:19–24.
Littell, R. C., G. A. Milliken, W. W. Stroup, R. D. Wolfinger, and O. Schabenberger (2005), SAS for Mixed Models, 2d ed. Cary, NC: SAS Institute Inc. See Chapter 12.
Thomas, L. (1997), "Retrospective power analysis." Conservation Biology, 11:276–280.
Operating System and Release Information
*
For software releases that are not yet generally available, the Fixed
Release is the software release in which the problem is planned to be
fixed.
| Type: | Usage Note |
| Priority: | low |
| Topic: | SAS Reference ==> Procedures ==> GLMPOWER
SAS Reference ==> Procedures ==> POWER
Analytics ==> Power and Sample Size
|
| Date Modified: | 2007-03-13 07:34:28 |
| Date Created: | 2007-03-12 13:10:59 |
