chd: Risk factors for coronary heart disease (CHD)

In ALA: Data sets and examples for the book "Applied Longitudinal Analysis"

Description

The data arise from a prospective study of potential risk factors for coronary heart disease (CHD).

Usage

data(chd)

Format

A data frame with 16 observations on the following 5 variables.

smoking

a factor with levels 0, 10, 20, and 30

blood.pressure

a factor with levels < 140 and >= 140

behaviour

a factor with levels B and A

nCHD

a numeric vector; count of Cases of CHD

years.followup

a numeric vector

Details

The study observed 3154 men aged 40-50 for an average of 8 years and recorded the incidence of cases of CHD. The potential risk factors included smoking, blood pressure, and personality/behaviour type.

Note

Original variable names have been adapted to R conventions.

Source

http://biosun1.harvard.edu/~fitzmaur/ala

References

Selvin S (1995) Practical Biostatistical Methods. Belmont, CA: Wadsworth Publishing Company.

Examples

str(chd)
summary(chd)

ALA documentation built on May 2, 2019, 5:39 p.m.