Accord.Tests.Statistics.TTestPowerAnalysisTest.TTestPowerAnalysisConstructorTest2 C# (CSharp) Method

        public void TTestPowerAnalysisConstructorTest2()
        {
            // Example from R's graphical manual
            // http://rgm2.lab.nig.ac.jp/RGM2/func.php?rd_id=pwr:pwr.t2n.test

            double effectSize = 0.6;
            int n1 = 90;
            int n2 = 60;

            TwoSampleTTestPowerAnalysis target;
            double actual, expected;

            target = new TwoSampleTTestPowerAnalysis(TwoSampleHypothesis.FirstValueIsGreaterThanSecond)
            {
                Effect = effectSize,
                Samples1 = n1,
                Samples2 = n2,
            };

            target.ComputePower();

            expected = 0.9737262;
            actual = target.Power;
            Assert.AreEqual(expected, actual, 1e-6);


            target = new TwoSampleTTestPowerAnalysis(TwoSampleHypothesis.FirstValueIsSmallerThanSecond)
            {
                Effect = effectSize,
                Samples1 = n1,
                Samples2 = n2,
            };

            target.ComputePower();

            expected = 0.0;
            actual = target.Power;
            Assert.AreEqual(expected, actual, 1e-6);



            target = new TwoSampleTTestPowerAnalysis(TwoSampleHypothesis.ValuesAreDifferent)
            {
                Effect = effectSize,
                Samples1 = n1,
                Samples2 = n2,
            };

            target.ComputePower();

            expected = 0.9470154;
            actual = target.Power;
            Assert.AreEqual(expected, actual, 1e-6);
        }