BIRTH.WEIGHT: Weight at Birth

In TRSbook: Functions and Datasets to Accompany the Book "The R Software: Fundamentals of Programming and Statistical Analysis"

Description

This study focused on risks associated with low weight at birth; the data were collected at the Baystate Medical Centre, Massachusetts, in 1986. Physicians have been interested in low weight at birth for several years, because underweight babies have high rates of infant mortality and infant anomalies. The behaviour of the mother-to-be during pregnancy (diet, smoking habits) can have a significant impact on the chances of having a full-term pregnancy, and thus of giving birth to a child of normal weight. The data file includes information on 189 women (identification number: ID) who came to the centre for consultation. Weight at birth is categorized as low if the child weighs less than 2,500 g.

Usage

data(BIRTH.WEIGHT)

Format

A data frame with 189 observations measured on the following 11 variables.

ID

Numeric. Identification.

AGE

Numeric. Age of mother.

LWT

Numeric. Weight of mother at last menstrual period.

RACE

1=white, 2=black, 3=other. Race of mother.

SMOKE

Yes=1, No=0. Smoking during pregnancy.

PTL

0=none, 1=one, 2=two, etc. Number of premature births in medical history.

HT

Yes=1, No=0. Medical history of hypertension.

UI

Yes=1, No=0. Uterine irritability.

FVT

0=none, 1=one, etc. Number of medical consultations during first trimester

BWT

Numeric. Grams.

LOW

Yes=1, No=0. Weight at birth less than 2,500g

Author(s)

Lafaye de Micheaux Pierre <[e-mail]>, Remy Drouilhet <[e-mail]>, Liquet Benoit <[e-mail]>

Source

http://www.biostatisticien.eu/springeR/

Examples

data(BIRTH.WEIGHT)
str(BIRTH.WEIGHT) 

Example output

Loading required package: xtable
Loading required package: RColorBrewer
Loading required package: gdata
sh: 1: cannot create /dev/null: Permission denied
gdata: Unable to locate valid perl interpreter
gdata: 
gdata: read.xls() will be unable to read Excel XLS and XLSX files
gdata: unless the 'perl=' argument is used to specify the location of a
gdata: valid perl intrpreter.
gdata: 
gdata: (To avoid display of this message in the future, please ensure
gdata: perl is installed and available on the executable search path.)
sh: 1: cannot create /dev/null: Permission denied
gdata: Unable to load perl libaries needed by read.xls()
gdata: to support 'XLX' (Excel 97-2004) files.

gdata: Unable to load perl libaries needed by read.xls()
gdata: to support 'XLSX' (Excel 2007+) files.

gdata: Run the function 'installXLSXsupport()'
gdata: to automatically download and install the perl
gdata: libaries needed to support Excel XLS and XLSX formats.

Attaching package: 'gdata'

The following object is masked from 'package:stats':

    nobs

The following object is masked from 'package:utils':

    object.size

The following object is masked from 'package:base':

    startsWith

Loading required package: IndependenceTests
'data.frame':	189 obs. of  11 variables:
 $ ID   : int  85 86 87 88 89 91 92 93 94 95 ...
 $ AGE  : int  19 33 20 21 18 21 22 17 29 26 ...
 $ LWT  : int  182 155 105 108 107 124 118 103 123 113 ...
 $ RACE : int  2 3 1 1 1 3 1 3 1 1 ...
 $ SMOKE: int  0 0 1 1 1 0 0 0 1 1 ...
 $ PTL  : int  0 0 0 0 0 0 0 0 0 0 ...
 $ HT   : int  0 0 0 0 0 0 0 0 0 0 ...
 $ UI   : int  1 0 0 1 1 0 0 0 0 0 ...
 $ FVT  : int  0 3 1 2 0 0 1 1 1 0 ...
 $ BWT  : int  2523 2551 2557 2594 2600 2622 2637 2637 2663 2665 ...
 $ LOW  : num  0 0 0 0 0 0 0 0 0 0 ...

TRSbook documentation built on May 2, 2019, 2:45 a.m.