SAS/STAT 9.1 Users Guide, Volumes 1-7

9.1  

The POWER procedure performs prospective analyses for a variety of goals such as the following:

  • determining the sample size required to get a significant result with adequate probability (power)

  • characterizing the power of a study to detect a meaningful effect

  • conducting what-if analyses to assess sensitivity of the power or required sample size to other factors

This procedure covers a variety of statistical analyses such as t tests, equivalence tests, and confidence intervals for means; exact binomial, chi-square, Fisher's exact, and McNemar tests for proportions ; multiple regression and correlation; one-way analysis of variance; and rank tests for comparing survival curves.

The POWER procedure is one of several tools available in SAS/STAT software for power and sample size analysis. PROC GLMPOWER covers more complex linear models, and the Power and Sample Size Application provides a user interface and implements many of the analyses supported in the procedures.

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