zy: Estimating the Relative Risk Based on the Odds Ratio
Description
Estimating the relative risk based on the (adjusted) Odds Ratio from multiple logistic regression or other multiple regression models. The method was based on Zhang and Yu (JAMA, 1998)
Usage
zy(risk, oddsratio)
Arguments
risk
the risk rate of having a positive outcome in the control or unexposed group
oddsratio
odds ratio estimated from multiple logistic regression or other multiple regression models
Value
the estimated relative risk
Details
Primarily for the adjusted odds ratio, the estimated relative risk is given by:
odds ratio / (1 - risk + risk * odds ratio)
References
Zhang J, Yu KF (1998).
What's the relative risk? A method of correcting the odds ratio in cohort studies of common outcomes.
JAMA, 280(19), 1690-1.