# ex2220: Cancer Deaths of Atomic Bomb Survivors In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

## Description

The data are the number of cancer deaths among survivors of the atomic bombs dropped on Japan during World War II, categorized by time (years) after the bomb that death occurred and the amount of radiation exposure that the survivors received from the blast. Also listed in each cell is the person- years at risk, in 100's. This is the sum total of all years spent by all persons in the category. The data can be analyzed by supposing the number of cancer deaths in each cell is Poisson with mean = risk x rate, where risk is the person-years at risk and rate is the rate of cancer deaths per person per year. How does the rate depend on the radiation exposure, after accounting for years after exposure?

## Usage

 1 ex2220

## Format

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

Exposure

YearsAfter

years after the exposure

AtRisk

number of survivors in the group

Deaths

number of survivors in the group who died of Cancer

## Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

## References

Pierce, D.A., personal communication

## Examples

 1 str(ex2220)

### Example output

'data.frame':	42 obs. of  4 variables:
\$ Exposure  : int  0 0 0 0 0 0 0 25 25 25 ...
\$ YearsAfter: Factor w/ 7 levels "0to7","12to15",..: 1 7 2 3 4 5 6 1 7 2 ...
\$ AtRisk    : int  262 243 240 237 233 227 220 313 290 285 ...
\$ Deaths    : int  10 12 19 31 35 48 73 17 17 17 ...

Sleuth3 documentation built on May 31, 2017, 1:56 a.m.