--- a
+++ b/inst/parameterize.m
@@ -0,0 +1,29 @@
+# Copyright (C) 2003,2004  Michael Creel <michael.creel@uab.es>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program 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 program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+# usage: theta = parameterize(theta, otherargs)
+# 
+# This is an empty function, provided so that
+# delta_method will work as is. Replace it with
+# the parameter transformations your models use.
+# Note: you can let "otherargs" contain the model
+# name so that this function can do parameterizations
+# for a variety of models
+
+function theta = parameterize(theta, otherargs)
+
+endfunction