Where Do Sampling Weights Come From?

Weights make it possible to form inferences based on a sample that does not look exactly like the population from which it was drawn. There are multiple reasons why the sample may not exactly reflect the population. These include: The use of stratification and/or cluster sampling causes certain elements to have a higher probability of selection into the sample than others. Some respondents are systematically less likely to respond to an invitation to participate in a survey.
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