| 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 https://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)