In this sampling strategy the population of interest is stratified by key variables (e.g. sex, race/ethnicity) to ensure that the sample represents the correct proportion of individuals in the in the population with these characteristics. Subsequently, the sample is drawn randomly from each stratum in order to preserve proportionate representation of each stratum in the population.
Gordis, L. 2000. Epidemiology, 2nd ed., Philadelphia, PA: Elsevier Science.
Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.
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