doctors {dobson}

Doctors data from table 9.1

Description

Data from the famous doctors study of smoking conducted by Sir Richard Doll and colleagues

Usage

data(doctors)

Format

A tibble with 10 observations and the following 4 variables.

age

age group

smoking

smoker or non-smoker

deaths

number of deaths

person-years

person years of of observation at the time of the analysis

References

Breslow, N. E. and N. E. Day (1987). Statistical Methods in Cancer Research, Volume 2: The Design and Analysis of Cohort Studies. Lyon: International Agency for Research on Cancer.

Examples

data(doctors)
summary(doctors)