SSI/Income ratio
Age
Years of education
Presc-drugs expense
Private insurance
Female
Hiapanic
Married
V-good health
Good health
Fair health
Poor health
Poor
Low income
Middle income
Metropolitan stat area
Firm size
Multiple locations
Income
Priority list cond
Total chronic cond
Black
Insured thro emp/union
log(drugexp)
Age-squared
log(income)
vg or good health
fair or poor health
Black or Hispanic
esample() from estimates store