The PoEdata package is not on CRAN it is on github. The instructions in the repository are:
The package works best with RStudio. To install the "PoEdata" package, type the following script lines in the Console window of RStudio:
install.packages("devtools") # if not already installed
library(devtools)
install_git("https://github.com/ccolonescu/PoEdata")
111