powered by
Study on coronary deaths involving British doctors.
Britishdoc
A data frame with 10 observations on the following 4 variables
age
factor with 5 levels (35-44, 45-54, 55-64, 65-74, 75-84)
35-44, 45-54, 55-64, 65-74, 75-84
smoke
factor with 2 levels (n, y)
n, y
person.years
total number of observed person-years
deaths
number of observed deaths by coronary disease