Smoking Deaths Among Doctors

SUMMARY:
       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.

DATA DESCRIPTION:
       This data frame contains the following columns:

age:   The mid-point of the 10 year age-group for the doctors.
smoke:    An indicator of whether the doctors smoked (1)  or  not
       (0).
n:     The number of person-years in the category.
y:      The  number  of  deaths  attributed  to  coronary  artery
       disease.
ns:    The number of smoker years in the category (smoke*n).

SOURCE:
       The data were obtained from

       Breslow, N.E. (1985) Cohort Analysis in Epidemiology. In A
       Celebration  of Statistics A.C. Atkinson and S.E. Fienberg
       (editors), 109-143.  Springer-Verlag.

OTHER REFERENCES:
       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.