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In the Understanding America Study, sample weights are survey-specific. They are provided with each completed UAS survey and are meant to make each survey data set representative of the U.S. population aged 18 and older with respect to a pre-defined set of socio-demographic variables. Sample weights are constructed in two steps. In a first step, a base weight is assigned to each survey respondent in order to compensate for the disproportionate sampling of Native Americans. In a second step, post-stratification weights are generated to bring the final survey sample in line with the reference population as far as the distribution of key variables of interest is concerned. The sub-sample of families with young children in Los Angeles County receives no weight as it is not possible to determine the corresponding population counts accurately. 

Detailed information about the UAS weighting procedures can be found in the UAS Weighting Procedures. For questions about these procedures or if a weighted data set is not yet available for a survey, please email uas-weights-l@mymaillists.usc.edu.