Results were weighted to account for sampling design features and, through post-stratification, for nonresponse and non-coverage that resulted from the study-specific sample design. To evaluate sample selection bias, we compared the weighted analysis sample with 2010 Census data for gender, educational attainment, and age (see Table 1). Correspondence with the Census is excellent in terms of gender, but the sample somewhat underrepresents young people and overrepresents people with higher educational attainment. To assess the possibility that sampling biases affected the findings, we examine results for their generality across age, education, and gender groups.
