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An instrument used to collect a sample from a population. Surveying often refers to sampling of human populations and is primarily done by administering questionnaires or interviewing individuals.

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Post stratification on a twophase object in the R survey package

I am working with NHANES survey data and I am trying to use a twophase survey design along with calibration to adjust for item non-response. … For now, I am following an example from Lumley's Survey book pretty closely to do this. …
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