\Header{breslow}{Smoking Deaths Among Doctors}
\keyword{datasets}{breslow}
\begin{Description}\relax
The \code{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
\code{breslow} data set contains the person-years of observations and deaths from
coronary artery disease accumulated during the first ten years of the study.
\end{Description}
\begin{Usage}
\begin{verbatim}
data(breslow)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data frame contains the following columns:


\describe{
\item[\code{age}] The mid-point of the 10 year age-group for the doctors.

\item[\code{smoke}] An indicator of whether the doctors smoked (1) or not (0).

\item[\code{n}] The number of person-years in the category.

\item[\code{y}] The number of deaths attributed to coronary artery disease.

\item[\code{ns}] The number of smoker years in the category (\code{smoke*n}).
}
\end{Format}
\begin{Source}\relax
The data were obtained from


Breslow, N.E. (1985) Cohort Analysis in Epidemiology. In 
\emph{A Celebration of Statistics} 
A.C. Atkinson and S.E. Fienberg (editors), 109--143.
Springer-Verlag.
\end{Source}
\begin{References}\relax
Davison, A.C. and Hinkley, D.V. (1997) 
\emph{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. 
\emph{National Cancer Institute Monograph}, \bold{19}, 205-268.
\end{References}

