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diff --git a/bench/statistics.py b/bench/statistics.py
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+#! /usr/bin/env python2.2
+
+# distcc/benchmark -- automated system for testing distcc correctness
+# and performance on various source trees.
+
+# Copyright (C) 2003 by Martin Pool
+
+# 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
+
+
+# Based in part on http://starship.python.net/crew/jhauser/NumAdd.py.html by Janko Hauser
+
+
+import Numeric
+
+def var(m):
+    """
+    Variance of m.
+    """
+    if len(m) < 2:
+        return None
+    mu = Numeric.average(m)
+    return (Numeric.add.reduce(Numeric.power(Numeric.ravel(m)-mu, 2))
+            / (len(m)-1.))
+
+def std(m):
+    """
+    Standard deviation of m.
+    """
+    v = var(m)
+    return v and Numeric.sqrt(v)
+
+def mean(m):
+    return Numeric.average(m)