Study design VI - Ecological studies.
Previously in this series I have given an overview of the main types of study design and the techniques used to minimise biased results. In this article I describe more fully ecological studies, their uses, advantages and limitations.
Levin
Kate Ann
KA
Child and Adolescent Health Research Unit, University of Edinburgh, Edinburgh, Scotland, UK.
D016021:Epidemiologic Studies; D006801:Humans