pcse: Panel-Corrected Standard-Error Estimation. Copyright (C) 2007 Delia Bailey and Jonathan N. Katz This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Please contact: Delia Bailey Washington University in St. Louis School of Law, CERL One Brookings Drive Campus Box 1120 St. Louis, MO 63130 email: dbailey@wustl.edu with any problems or suggestions.