Risk Factors Associated with Low Infant Birth Weight
Arguments
low
|
indicator of birth weight less than 2.5kg
|
age
|
mother's age in years
|
lwt
|
mother's weight in pounds at last menstrual period
|
race
|
mother's race (1 = white, 2 = black, 3 = other)
|
smoke
|
smoking status during pregnancy
|
ptl
|
number of previous premature labours
|
ht
|
history of hypertension
|
ui
|
presence of uterine irritability
|
ftv
|
number of physician visits during the first trimester
|
bwt
|
birth weight in grams
|
SUMMARY
The birthwt
data frame has 189 rows and 10 columns.
The data were collected at Baystate Medical Center, Springfield, Mass
during 1986.DATA DESCRIPTION
This data frame contains the following columns:SOURCE
Hosmer, D.W. and Lemeshow, S. (1989)
Applied Logistic Regression.
New York: WileyExamples
attach(birthwt)
race <- factor(race, labels=c("white", "black", "other"))
ptd <- factor(ptl > 0)
ftv <- merge.levels(factor(ftv), c(1,2,3,3,3,3), c("0", "1", "2+"))
ftv <- factor(ftv)
levels(ftv)[-(1:2)] <- "2+"
bwt <- data.frame(low,age,lwt,race,smoke,ptd,ht,ui,ftv)
detach("birthwt")
options(contrasts = c("contr.treatment", "contr.poly"))
glm(low ~ ., binomial, bwt)