Stratified sampling and Quota sampling are similar in that in both, population is divided into categories/ strata and subjects are selected from each category. The purpose is to select a representative sample and/or to allow sub –group analyses.
However, there are certain differences between “Stratification” and “Quota” sampling. In the former, selection of subjects is by simple random sampling once the categories have been created. Call-backs are used to get that particular subject.