Quota samples

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A quota sample is one of the most common forms of arbitrary, i.e. non-probability, sampling. It is obtained by respecting certain predetermined proportions among the base population surveyed. This type of sampling ensures that the convenience samples respect the structure of the population and its quotas.

In practice, the first step in obtaining such a sample is to identify control variables, i.e., characteristics that will allow quotas to be set for each subset. For example, you can use demographics or product usage as control variables. Quota sizes should be proportional to the relative size of each subset selected from the base population.