Paper Information

Journal:   ARCHIVES OF IRANIAN MEDICINE   January 2019 , Volume 22 , Number 1; Page(s) 46 To 49.
 
Paper: 

Research Methods: Risk Ratio Estimation in Longitudinal Studies

 
 
Author(s):  Talebi Seyedeh Solmaz, Mohammad Kazem, Rasekhi Aliakbar, Mansournia Mohammad Ali*
 
* Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
 
Abstract: 
Longitudinal studies are very common in medical, behavioral, and interventional sciences. One measure of effect of interest in longitudinal studies is risk ratio, naturally estimated by log-binomial regression which suffers from convergence problems. Odds ratio (OR) does not approximate risk ratio (RR) well when the outcome is common, so alternative methods have been introduced in cohort studies with one follow-up visit. In this paper, we illustrate two simple methods: the COPY method and the modified log-Poisson regression for RR estimation in longitudinal data setting. Our unpublished simulation study on RR estimation in longitudinal data setting suggests that the COPY method performs well in terms of closeness of the RR estimate and true RR (mean square error) and so we suggest this method for RR estimation in longitudinal data setting.
 
Keyword(s): COPY method,Generalized estimation equations,Longitudinal data,Modified log-Poisson regression,Risk ratio
 
References: 
 
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