chdage: Coronary Heart Disease

In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

Description

A well known explanation of the heart disease is that as the age increases, the risk of coronary heart disease also increase. The current data set and the example may be found in Chapter 1 of Hosmer and Lemeshow (1990-2013).

Usage

data(chdage)

Format

A data frame with 100 observations on the following 3 variables.

ID

patient ID

AGE

age of the patient

CHD

Coronary Heart Disease indicator

Source

Hosmer and Lemeshow (1990-2013).

References

Hosmer, D.W., and Lemeshow, S. (1990-20013). Applied Logistic Regression, 3e. Wiley.

Examples

data(chdage)
plot(chdage$AGE,chdage$CHD,xlab="AGE",ylab="CHD Indicator", 
main="Scatter plot for CHD Data")
agegrp <- cut(chdage$AGE,c(19,29,34,39,44,49,54,59,69),include.lowest=TRUE,
labels=c(25,seq(31.5,56.5,5),64.5))
mp <- c(25,seq(31.5,56.5,5),64.5) # mid-points
chd_percent <- prop.table(table(agegrp,chdage$CHD),1)[,2]
points(mp,chd_percent,"l",col="red")

Example output

ACSWR documentation built on May 2, 2019, 6:53 a.m.