The data in this data frame are the number of cancer deaths among survivors of the atomic bombs dropped on Japan during World War II, categorised by time (years) after the bomb that death occurred and the amount of radiation exposure that the survivors received from the blast (Data from D.A. Pierce, personal communication.) Also listed in each cell is the person-years at risk, in 100s. This is the sum total of all years spent by all persons in the category.
A data frame with 42 observations on the following 4 variables.
Estimated exposure to radiation (in rads)
Years after exposure, factor with 7 levels
Number of cancer deaths
Person-years at risk (in 100s)
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
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