Hello everyone.

I am trying to get a confidence interval for the risk ratio 
(vaccinates/control) from the following model:

fit.1<-glm(sick~trt + loc, data=b, family=binomial).

here trt is one for vaccinates and 0 for control, loc is a binary (1/0) 
variable.

I am trying to get a reference to apply the delta method to get my CI. Any 
ideal?


*******************************************
Antonio Paredes
USDA- Center for Veterinary Biologics
Biometrics Unit
510 South 17th Street, Suite 104
Ames, IA 50010
(515) 232-5785


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