------------------------------------------------------------------------------- help for powerlog -------------------------------------------------------------------------------Logistic regression power analysis
powerlog , p1(value) p2(value) [ rsq(value) alpha(value) help ]
Description
powerlog performs power analysis for logistic regression designs with a continuous predictor variable. Multiple predictor models can be accomodated using the rsq option.
powerlog Options
p1 estimated probability of a 1 at the mean of the predictor (required).
p2 estimated probability of a 1 at the mean + 1 sd of the predictor (required).
rsq squared multiple correlation of the predictor with all other predictors. Use rsq=0 for a 1-predictor model. (default = 0).
alpha the alpha level (default = .05).
help displays explanation of terms.
Examples
. powerlog, p1(.25) p2(.35) alpha(.01) help . powerlog, p1(.25) p2(.35) rsq(.4)
Acknowledgements
Based on (copied from) on the SAS macro program, POWERLOG.SAS (version 1.1), Created 1998, revised 2002, by Michael Friendly <FRIENDLY@YorkU.CA>.
Author
Philip B. Ender UCLA Academic Technology Services enderatucla.edu