This version of the data set has been deprecated and will not be
supported in future versions. Please use Birthwt
instead.
data(birthwt.grpreg)This data frame contains the following columns:
low Indicator of birth weight less than 2.5kg
bwt Birth weight in kilograms
age1,age2,age3 Orthogonal polynomials of
first, second, and third degree representing mother's age in years
lwt1,lwt2,lwt3 Orthogonal polynomials of
first, second, and third degree representing mother's weight in pounds
at last menstrual period
white,black Indicator functions for mother's race;
"other" is reference group
smoke smoking status during pregnancy
ptl1,ptl2m Indicator functions for one or for two or
more previous premature labors, respectively. No previous premature
labors is the reference category.
ht History of hypertension
ui Presence of uterine irritability
ftv1,ftv2,ftv3m Indicator functions for
one, for two, or for three or more physician visits during the first
trimester, respectively. No visits is the reference category.