The multilevelPSA package is not hosted on github.

multilevelPSA Package for R

This page summarizes the multilevelPSA package for R.

The project summary page you can find here.

The following example demonstrates how to use the multilevelPSA package (more soon...).

#Install the package
library(devtools)
install_github('multilevelPSA', 'jbryer')

#Load the package
library(multilevelPSA)

#List the available functions
ls('package:multilevelPSA')

Links for Rdata versions of the OECD Programme for International Student Assessment (PISA):

Or you can download these files directly from R:

download.file('http://multilevelpsa.r-forge.r-project.org/pisa/pisa.student.Rdata', 'pisa.student.Rdata')
download.file('http://multilevelpsa.r-forge.r-project.org/pisa/pisa.school.Rdata', 'pisa.school.Rdata')