new file mode 100644
--- /dev/null
+++ b/scripts/statistics/distributions/chi2cdf.m
@@ -0,0 +1,45 @@
+## Copyright (C) 1995, 1996, 1997  Kurt Hornik
+##
+## This file is part of Octave.
+##
+## Octave 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, or (at your option)
+## any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} chisquare_cdf (@var{x}, @var{n})
+## For each element of @var{x}, compute the cumulative distribution
+## function (CDF) at @var{x} of the chisquare distribution with @var{n}
+## degrees of freedom.
+## @end deftypefn
+
+## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at>
+## Description: CDF of the chi-square distribution
+
+function cdf = chisquare_cdf (x, n)
+
+  if (nargin != 2)
+    usage ("chisquare_cdf (x, n)");
+  endif
+
+  if (!isscalar (n))
+    [retval, x, n] = common_size (x, n);
+    if (retval > 0)
+      error ("chisquare_cdf: x and n must be of common size or scalar");
+    endif
+  endif
+
+  cdf = gamma_cdf (x, n / 2, 1 / 2);
+
+endfunction