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
Arguments
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)