Accord.Tests.Statistics.ToolsTest.WeightedVarianceTest1 C# (CSharp) Method

        public void WeightedVarianceTest1()
        {
            double[] original = { 5, 5, 1, 4, 1, 2, 2, 3, 3, 3, 4, 3, 3, 3, 4, 3, 2, 3 };
            double expected = Measures.Variance(original, unbiased: false);

            double[] weights = { 2, 1, 1, 1, 2, 3, 1, 3, 1, 1, 1, 1 };
            double[] samples = { 5, 1, 4, 1, 2, 3, 4, 3, 4, 3, 2, 3 };

            weights = weights.Divide(weights.Sum());
            double actual = Measures.WeightedVariance(samples, weights, unbiased: false);

            Assert.AreEqual(expected, actual);
        }