1 files changed, 100 insertions, 0 deletions
diff --git a/src/boost/libs/accumulators/test/skewness.cpp b/src/boost/libs/accumulators/test/skewness.cpp
new file mode 100644
index 00000000..8a824688
--- /dev/null
+++ b/src/boost/libs/accumulators/test/skewness.cpp
@@ -0,0 +1,100 @@
+//  (C) Copyright 2006 Eric Niebler, Olivier Gygi.
+//  Use, modification and distribution are subject to 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)
+
+// Test case for skewness.hpp
+
+#include <boost/random.hpp>
+#include <boost/test/unit_test.hpp>
+#include <boost/test/floating_point_comparison.hpp>
+#include <boost/accumulators/numeric/functional/vector.hpp>
+#include <boost/accumulators/numeric/functional/complex.hpp>
+#include <boost/accumulators/numeric/functional/valarray.hpp>
+#include <boost/accumulators/accumulators.hpp>
+#include <boost/accumulators/statistics/stats.hpp>
+#include <boost/accumulators/statistics/skewness.hpp>
+#include <sstream>
+#include <boost/archive/text_oarchive.hpp>
+#include <boost/archive/text_iarchive.hpp>
+
+using namespace boost;
+using namespace unit_test;
+using namespace boost::accumulators;
+
+///////////////////////////////////////////////////////////////////////////////
+// test_stat
+//
+void test_stat()
+{
+    // tolerance in %
+    // double epsilon = 1;
+
+    accumulator_set<double, stats<tag::skewness > > acc1;
+    accumulator_set<int, stats<tag::skewness > > acc2;
+
+    // two random number generators
+    boost::lagged_fibonacci607 rng;
+    boost::normal_distribution<> mean_sigma(0,1);
+    boost::variate_generator<boost::lagged_fibonacci607&, boost::normal_distribution<> > normal(rng, mean_sigma);
+
+    for (std::size_t i=0; i<100000; ++i)
+    {
+        acc1(normal());
+    }
+
+    // This check fails because epsilon is relative and not absolute
+    // BOOST_CHECK_CLOSE( skewness(acc1), 0., epsilon );
+
+    acc2(2);
+    acc2(7);
+    acc2(4);
+    acc2(9);
+    acc2(3);
+
+    BOOST_CHECK_EQUAL( mean(acc2), 5 );
+    BOOST_CHECK_EQUAL( accumulators::moment<2>(acc2), 159./5. );
+    BOOST_CHECK_EQUAL( accumulators::moment<3>(acc2), 1171./5. );
+    BOOST_CHECK_CLOSE( skewness(acc2), 0.406040288214, 1e-6 );
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// test_persistency
+//
+void test_persistency()
+{
+    double epsilon = 1e-6;
+    std::stringstream ss;
+    {
+        accumulator_set<int, stats<tag::skewness > > acc;
+        acc(2);
+        acc(7);
+        acc(4);
+        acc(9);
+        acc(3);
+
+        BOOST_CHECK_EQUAL(accumulators::moment<3>(acc), 1171./5.);
+        BOOST_CHECK_CLOSE(skewness(acc), 0.406040288214, epsilon);
+        boost::archive::text_oarchive oa(ss);
+        acc.serialize(oa, 0);
+    }
+    accumulator_set<int, stats<tag::skewness > > acc;
+    boost::archive::text_iarchive ia(ss);
+    acc.serialize(ia, 0);
+    BOOST_CHECK_EQUAL(accumulators::moment<3>(acc), 1171./5.);
+    BOOST_CHECK_CLOSE(skewness(acc), 0.406040288214, epsilon);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// init_unit_test_suite
+//
+test_suite* init_unit_test_suite( int argc, char* argv[] )
+{
+    test_suite *test = BOOST_TEST_SUITE("skewness test");
+
+    test->add(BOOST_TEST_CASE(&test_stat));
+    test->add(BOOST_TEST_CASE(&test_persistency));
+
+    return test;
+}
+