R Dataset / Package boot / breslow

On this R-data statistics page, you will find information about the breslow data set which pertains to Smoking Deaths Among Doctors. The breslow data set is found in the boot R package. You can load the breslow data set in R by issuing the following command at the console data("breslow"). This will load the data into a variable called breslow. If R says the breslow data set is not found, you can try installing the package by issuing this command install.packages("boot") and then attempt to reload the data with the library() command. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the breslow R data set. The size of this file is about 225 bytes.

Smoking Deaths Among Doctors


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.




This data frame contains the following columns:


The mid-point of the 10 year age-group for the doctors.


An indicator of whether the doctors smoked (1) or not (0).


The number of person-years in the category.


The number of deaths attributed to coronary artery disease.


The number of smoker years in the category (smoke*n).


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.


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.

Dataset imported from https://www.r-project.org.

Attachments: csv, json

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