A collection of variables taken for each new mother in a Child and Health Development Study.
data(babies)A data frame with 1,236 observations on the following 23 variables.
identification number
5= single fetus
1= live birth that survived at least 28 days
birth date where 1096=January1,1961
length of gestation in days
infant's sex 1=male 2=female 9=unknown
birth weight in ounces (999 unknown)
total number of previous pregnancies including fetal deaths and still births, 99=unknown
mother's race 0-5=white 6=mex 7=black 8=asian 9=mixed 99=unknown
mother's age in years at termination of pregnancy, 99=unknown
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
mother's height in inches to the last completed inch 99=unknown
mother prepregnancy wt in pounds, 999=unknown
father's race, coding same as mother's race.
father's age, coding same as mother's age.
father's education, coding same as mother's education.
father's height, coding same as for mother's height
father's weight coding same as for mother's weight
1=married, 2= legally separated, 3= divorced, 4=widowed, 5=never married
family yearly income in \$2500 increments 0 = under 2500, 1=2500-4999, ..., 8= 12,500-14,999, 9=15000+, 98=unknown, 99=not asked
does mother smoke? 0=never, 1= smokes now, 2=until current pregnancy, 3=once did, not now, 9=unknown
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 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
# NOT RUN {
data(babies)
plot(wt ~ factor(smoke), data=babies)
plot(wt1 ~ dwt, data=babies, subset=wt1 < 800 & dwt < 800)
# }
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