Slacks-based Measure of Efficiency in Stata
net install sbmeff, from("https://raw.githubusercontent.com/kerrydu/sbmeff/master/")
Alternatively, download the zipfile and unzip it to your computer disk.
copy https://codeload.github.com/kerrydu/sbmeff/zip/master sbmeff-master.zip
unzipfile sbmeff-master.zip
net install sbmeff, from(`c(pwd)'/sbmeff-master)