A sample of 6,224 individuals from the year 1721 who were exposed to smallpox in Boston. Some of them had received a vaccine (inoculated) while others had not. Doctors at the time believed that inoculation, which involves exposing a person to the disease in a controlled form, could reduce the likelihood of death.

## Usage

smallpox

## Format

A data frame with 6224 observations on the following 2 variables.

result

Whether the person died or lived.

inoculated

## Source

Fenner F. 1988. Smallpox and Its Eradication (History of International Public Health, No. 6). Geneva: World Health Organization. ISBN 92-4-156110-6.

## Examples


data(smallpox)
table(smallpox)
#>        inoculated
#> result    no  yes
#>   died   844    6
#>   lived 5136  238