[R] power of logistic regression in case control design

[Bingshan Li]

Hi All,

This is not directly related to R but I post the questions here since  
there are a lot of experts on statistics. I want to calculate power  
of logistic regression using likelihood ratio test in unmatched case  
control design. The paper I have read is "power calculations for  
likelihood ratio tests in generalized linear models" by Steven G.  
Self in 1992. They showed a formula for calculating power for  
prospective cohort design. Can I plug in the various parameters from  
case control study? That is, can I pretend that the case control data  
I have is a prospective cohort study? I guess I can do this since in  
principal logistic regression is valid for both case control and  
cohort design in estimating odds ratio.

Thanks a lot!