birthwt

0th

Percentile

The birthwt data frame has 189 rows and 10 columns. The data were collected at Baystate Medical Center, Springfield, Mass during 1986.

Keywords
datasets
Usage
birthwt
Format

This data frame contains the following columns:

low
indicator of birth weight less than 2.5 kg.
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.

References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

Aliases
  • birthwt
Examples
library(MASS) bwt <- with(birthwt, { race <- factor(race, labels = c("white", "black", "other")) ptd <- factor(ptl > 0) ftv <- factor(ftv) levels(ftv)[-(1:2)] <- "2+" data.frame(low = factor(low), age, lwt, race, smoke = (smoke > 0), ptd, ht = (ht > 0), ui = (ui > 0), ftv) }) options(contrasts = c("contr.treatment", "contr.poly")) glm(low ~ ., binomial, bwt)
Documentation reproduced from package MASS, version 7.3-47, License: GPL-2 | GPL-3

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