This code is

  Copyright (C) 1997-2009 Walter R. Mebane, Jr. and Jasjeet S. Sekhon

All code is subject to the GNU General Public License, Version 3.
Copies of GPL-3 are available both on the GNU website
(http://www.gnu.org/licenses/gpl-3.0.html) and in your R distribution
(R_HOME_DIR/share/licenses/GPL-3).

