ex1518 {Sleuth3}

Effectiveness of Measles Vaccine

Description

The data are the number of measles cases reported in the United States for each year from 1950 to 2008. A goal is to explore the effect of the introduction of the measles vaccine in 1963 on the series mean.

Usage

ex1518

Format

A data frame with 59 observations on the following 3 variables.

Year

year

Cases

number of measles cases

Vaccine

a factor with levels "no" and "yes" indicating whether the measles vaccine had been licensed or not (yes for every year starting with 1963)

Source

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

References

Center for Disease Control,
https://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/G/cases-deaths.pdf retrieved on July 23, 2009

Examples

str(ex1518)