babies {UsingR} | R Documentation

## Mothers and their babies data

### Description

A collection of variables taken for each new mother in a Child and Health Development Study.

### Usage

    data(babies)

### Format

A data frame with 1,236 observations on the following 23 variables.

Variables in data file
id
  identification number
pluralty
  5= single fetus
outcome
  1= live birth that survived at least 28 days
date
  birth date where 1096=January1,1961
gestation
  length of gestation in days
sex
  infant's sex 1=male 2=female 9=unknown
wt
  birth weight in ounces (999 unknown)
parity
  total number of previous pregnancies including fetal deaths and still births, 99=unknown
race
  mother's race 0-5=white 6=mex 7=black 8=asian 9=mixed 99=unknown
age
  mother's age in years at termination of pregnancy, 99=unknown
ed
  mother's education 0= less than 8th grade, 1 = 8th -12th grade - did not graduate, 2= HS graduate–no other schooling , 3= HS+trade, 4=HS+some college 5= College graduate, 6&7 Trade school HS unclear, 9=unknown
ht
  mother's height in inches to the last completed inch 99=unknown
wt1
  mother prepregnancy wt in pounds, 999=unknown
drace
  father's race, coding same as mother's race.
dage
  father's age, coding same as mother's age.
ded
  father's education, coding same as mother's education.
dht
  father's height, coding same as for mother's height
dwt
  father's weight coding same as for mother's weight
marital
  1=married, 2= legally separated, 3= divorced, 4=widowed, 5=never married
inc
  family yearly income in $2500 increments 0 = under 2500, 1=2500-4999, ..., 8= 12,500-14,999, 9=15000+, 98=unknown, 99=not asked
smoke
  does mother smoke? 0=never, 1= smokes now, 2=until current pregnancy, 3=once did, not now, 9=unknown
time
  If mother quit, how long ago? 0=never smoked, 1=still smokes, 2=during current preg, 3=within 1 yr, 4= 1 to 2 years ago, 5= 2 to 3 yr ago, 6= 3 to 4 yrs ago, 7=5 to 9yrs ago, 8=10+yrs ago, 9=quit and don't know, 98=unknown, 99=not asked
number
  number of cigs smoked per day for past and current smokers 0=never, 1=1-4,2=5-9, 3=10-14, 4=15-19, 5=20-29, 6=30-39, 7=40-60, 8=60+, 9=smoke but don't know,98=unknown, 99=not asked

### Source

This dataset is found from http://www.stat.berkeley.edu/users/statlabs/labs.html. It accompanies the excellent text Stat Labs: Mathematical Statistics through Applications Springer-Verlag (2001) by Deborah Nolan and Terry Speed.

### Examples

    data(babies)
    plot(wt ~ factor(smoke), data=babies)
    plot(wt1 ~ dwt, data=babies, subset=wt1 < 800 & dwt < 800)

[Package UsingR version 0.1-4 Index]