These are data from the 2009 NHIS survey. People who have read Mastering 'Metrics should recognize these data. They're featured prominently in that book and the authors' discussion of random assignment and experiments.
Format
A data frame with 18790 observations on the following 10 variables.
fmlis the respondent a woman?
hia numeric vector for whether respondent has at least some health insurance
hltha numeric vector for a health index, broadly understood
nwhiteis the respondent not white?
agethe respondent's age in years
yeduthe respondent's total years of education
famsizethe size of the respondent's family
emplis the respondent employed
incthe respondent's household/family income
perweighta numeric vector for weight