Introduction to Regression Analysis for Epidemiological Data (3)

We have covered the use and interpretation of regression analysis for risk factor analysis in the last two articles. This article steps back and introduces a very traditional and basic analysis to explain the fundamental difference between confounding and interaction/effect modification. I explain the concept of Mantel-Haenszel (MH) estimator and its analytical method using a mock data. While the readers may not use MH estimator frequently, I hope this article explains the concept of stratification and meaning of variable selections in regression analyses.