| Gestation | R Documentation |
Birth weight, date, and gestational period collected as part of the Child Health and Development Studies in 1961 and 1962. Information about the baby's parents — age, education, height, weight, and whether the mother smoked is also recorded.
data(Gestation)
A data frame with 1236 observations on the following variables.
id identification number
plurality all "single fetus" in this data set
outcome all "live birth" (survived at least 28 days) in this data set
date birth date where 1096=January 1, 1961
gestation length of gestation (in days)
wt birth weight (in ounces)
parity total number of previous pregnancies (including fetal deaths
and still births)
race mother's race: "asian", "black", "mex", "mixed", or "white"
age mother's age in years at termination of pregnancy
ed mother's education
ht mother's height in inches to the last completed inch
wt.1 mother's prepregnancy weight (in pounds)
drace father's race
dage father's age (in years)
ded father's education
dht father's height in inches to the last completed inch
dwt father's weight (in pounds)
marital marital status,
inc family yearly income in $2500 increments
smoke does mother smoke? (never, smokes now,
until current pregnancy, once did, not now)
time time since quitting smoking
(never smoked, still smokes, during current preg, within 1 year,
1 to 2 years ago, 2 to 3 years ago, 3 to 4 years ago,
5 to 9 years ago, 10+ years ago, quit and don't know
number number of cigarettes smoked per day for past and
current smokers (never, 1-4, 5-9, 10-14, 15-19, 20-29, 30-39, 40-60, 60+,
smoke but don't know)
The data were presented by Nolan and Speed to address the question of whether there is a link between maternal smoking and the baby's health for male births.
The book by Nolan and Speed describes the data in more detail and provides an Internet site for accessing them: https://www.stat.berkeley.edu/users/statlabs/
D Nolan and T Speed. Stat Labs: Mathematical Statistics Through Applications (2000), Springer-Verlag.
data(Gestation)