The breslow data frame has 10 rows and 5 columns.
In 1961 Doll and Hill sent out a questionnaire to all men on the British
Medical Register enquiring about their smoking habits. Almost 70% of
such men replied. Death certificates were obtained for medical practitioners
and causes of death were assigned on the basis of these certificates. The
breslow data set contains the person-years of observations and deaths from
coronary artery disease accumulated during the first ten years of the study.
breslowThis data frame contains the following columns:
ageThe mid-point of the 10 year age-group for the doctors.
smokeAn indicator of whether the doctors smoked (1) or not (0).
nThe number of person-years in the category.
yThe number of deaths attributed to coronary artery disease.
nsThe number of smoker years in the category (smoke*n).
Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.
Doll, R. and Hill, A.B. (1966) Mortality of British doctors in relation to smoking: Observations on coronary thrombosis. National Cancer Institute Monograph, 19, 205-268.