--- /dev/null
+# Copyright (C) 2005 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, see <http://www.gnu.org/licenses/>.
+
+# the form a user-written moment function should take
+
+function m = poisson_moments(theta, data, momentargs)
+ k = momentargs{1}; # use this so that data can hold dep, indeps, and instr
+ y = data(:,1);
+ x = data(:,2:k+1);
+ w = data(:, k+2:columns(data));
+ lambda = exp(x*theta);
+ e = y ./ lambda - 1;
+ m = diag(e) * w;
+endfunction