Description

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.

Usage

Format

A data frame with 42 observations on the following 4 variables.

Exposure

Estimated exposure to radiation (in rads)

Years

Years after exposure, factor with 7 levels

Deaths

Number of cancer deaths

Risk

Person-years at risk (in 100s)

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

Examples