4. Race-ethnicity: The respondent’s race was
categorized into Hispanics, African-American, other
nonwhites, and non-Hispanic whites (base).
5. Education: a set of dummies were included with high
school graduates or equivalent as the base: other
categories were less than high school, some college,
bachelor’s degree, and graduate degree.
6. Marital status: Three dummy variables, divorced or
separated, widowed, and never been married, were
included (married or living with a partner as base.)
7. Size of household: The number of people in
household was employed.
8. Region: 9-level Census Division code was employed
for region (Table 1).