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diff --git a/boost/accumulators/statistics/error_of.hpp b/boost/accumulators/statistics/error_of.hpp
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+///////////////////////////////////////////////////////////////////////////////
+// error_of.hpp
+//
+//  Copyright 2005 Eric Niebler. Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005
+#define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005
+
+#include <boost/mpl/placeholders.hpp>
+#include <boost/accumulators/framework/accumulator_base.hpp>
+#include <boost/accumulators/framework/extractor.hpp>
+#include <boost/accumulators/framework/depends_on.hpp>
+#include <boost/accumulators/statistics_fwd.hpp>
+
+namespace boost { namespace accumulators
+{
+
+namespace impl
+{
+    /// INTERNAL ONLY
+    ///
+    template<typename Feature>
+    struct this_feature_has_no_error_calculation
+      : mpl::false_
+    {
+    };
+
+    ///////////////////////////////////////////////////////////////////////////////
+    // error_of_impl
+    /// INTERNAL ONLY
+    ///
+    template<typename Sample, typename Feature>
+    struct error_of_impl
+      : accumulator_base
+    {
+        // TODO: specialize this on the specific features that have errors we're
+        // interested in.
+        BOOST_MPL_ASSERT((this_feature_has_no_error_calculation<Feature>));
+
+        // for boost::result_of
+        typedef int result_type;
+
+        error_of_impl(dont_care)
+        {
+        }
+
+        result_type result(dont_care) const
+        {
+            return 0;
+        }
+    };
+
+} // namespace impl
+
+///////////////////////////////////////////////////////////////////////////////
+// tag::error_of
+//
+namespace tag
+{
+    template<typename Feature>
+    struct error_of
+      : depends_on<Feature>
+    {
+        /// INTERNAL ONLY
+        ///
+        typedef accumulators::impl::error_of_impl<mpl::_1, Feature> impl;
+    };
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// extract::error_of
+//
+namespace extract
+{
+    BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, error_of, (typename))
+}
+
+using extract::error_of;
+
+// make tag::error_of<tag::feature(modifier)> work
+template<typename Feature>
+struct as_feature<tag::error_of<Feature> >
+{
+    typedef tag::error_of<typename as_feature<Feature>::type> type;
+};
+
+// make error_of<tag::mean> work with non-void weights (should become
+// error_of<tag::weighted_mean>
+template<typename Feature>
+struct as_weighted_feature<tag::error_of<Feature> >
+{
+    typedef tag::error_of<typename as_weighted_feature<Feature>::type> type;
+};
+
+}} // namespace boost::accumulators
+
+#endif