epmr is the main R package used in the book Introduction to Educational and Psychological Measurement, available at https://github.com/talbano/intro-measurement. The package contains tools for analyzing item performance, reliability, dimensionality, and validity with data from educational and psychological instruments.
epmr is not currently on CRAN. Install from Github using devtools:
install.packages("devtools")
devtools::install_github("talbano/epmr")