Sala i Martin's (88 countries)
Leamer's (87 countries)
Original (139 countries)
An object of class data.frame with 87 rows and 68 columns.
Questions? Problems? Suggestions? Tweet to @rdrrHQian@mutexlabs.com.
Please suggest features or report bugs with the GitHub issue tracker.
All documentation is copyright its authors; we didn't write any of that.