National Health and Nutrition Examination Survey III :Weighting and estimation methodology : executive summary
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National Health and Nutrition Examination Survey III :Weighting and estimation methodology : executive summary

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    The NHANES III sample represents the total civilian noninstitutionalized population, 2 months of age or older, in the 50 states of the United States. A four-stage sample design was used: (1) Primary Sampling Units (PSUs) comprising mostly single counties, (2) area segments within PSUs, (3) households within area segments, and (4) persons within households.

    The PSUs in the first stage were mostly individual counties; in a few cases, adjacent counties were combined to keep PSUs above a certain minimum size. There were 81 PSUs in the sample, selected with probability proportionate to measures of size (pps) and without replacement. The measure of size reflected the desire to oversample the minority groups in NHANES III. Thirteen large counties were chosen with certainty. The 13 certainty counties were divided into 21 survey locations for logistical and operational reasons. The data collection was carried out between October 1988 and September 1994. In order to permit separate analyses for two 3-year periods (referred to as Phase 1 and Phase 2), as well as for the entire field period, the sample of PSUs was randomly allocated to the two 3-year periods. One set was allocated to the first 3-year time period during which NHANES III was conducted (Phase 1, 1988-91), and the other set to the second 3-year period (Phase 2, 1991- 94). The allocation of PSUs to the two phases was made in a way that retained as much of the original stratification as possible.

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