Data from the famous doctors study of smoking conducted by Sir Richard Doll
and colleagues
Usage
data(doctors)
Arguments
Format
A tibble with 10 observations and the following 5 variables.
age
age group; 1 = 35 to 44 years, 2 = 45 to 54 years, 3 = 55 to 64 years, 4 = 65 to 74 years, 5 = 75 to 84 years
agesq
age group squared
smoking
smoker or non-smoker
deaths
number of deaths
personyears
person years 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.