Hello, Everyone. I need your help, I have a question regarding quota, stratified sampling and area sampling. so it is not directly SPSS related If a quota has been picked including key variables such as region,age and gender. Then the researcher went to each region and start selecting households randomly in that region and filling questionnaires with individuals to fill the quota. The sampling method here is still quota sampling? or is it a mixed of stratified and quota sampling? Also, since quota sampling is regarded as stratified sampling with a more or less non-random selection of units within strata, sampling error formulas cannot be applied to the results of quota samples. And I gather we should not apply the stratified random mean calculations to results obtained through quota sampling, or can we? How do we weight the results when there is now an element of randomness in the quota sampling? That is to say, the selection of respondents is done randomly until the pre-set quotas are reached. I'd love to hear what you think please.