a cross-section of 1388 individuals from 1988
a tibble containing:
birthwt: birth weight
cigarettes: number of cigarettes smoked per day during pregnancy
parity: birth order
race: a factor with levels "other"
and "white"
sex: a factor with levels "female"
and "male"
edmother: number of years of education of the mother
edfather: number of years of education of the father
faminc: family income
cigtax: per-pack state excise tax on cigarettes
MULL:97micsr