Confounding cannot be removed by?
All of the above REF: Park 20' edition page 68, http://en.wikipedia.org/wiki/Confounding There are various ways to modify a study design to actively exclude or control confounding variables In Case-control studies assign confounders to both groups, cases and controls, equally. In Coho studies matching is often done by only admitting ceain age groups or a ceain sex into the study population, and thus all cohos are comparable in regard to the possible confounding variable Stratification: Controlling for confounding by measuring the known confounders and including them as covariates in multivariate analyses
Assign confounders to both cases and controls
Stratification
Matching
All of the above
All of the above