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The CPS is a nationally representative probability sample survey of households. A multistage stratified sampling scheme is used to select sample households. The survey is conducted in approximately 50,00060,000 dwelling units monthly. Dwelling units are in-sample for 4 successive months, out-of-sample for the next 8 months, and then returned to the sample for the following 4 months. An adult member of each household provides information for all members of the household.