Akka.Cluster.Tests.EWMASpec.DataStream_must_calculate_alpha_from_halflife_and_collect_interval C# (CSharp) Method

        public void DataStream_must_calculate_alpha_from_halflife_and_collect_interval()
        {
            // according to http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
            var expectedAlpha = 0.1;
            // alpha = 2.0 / (1 + N)
            var n = 19;
            var halfLife = n / 2.8854;
            var collectInterval = TimeSpan.FromSeconds(1);
            var halfLifeDuration = TimeSpan.FromMilliseconds(halfLife * 1000);
            var alpha = EWMA.CalculateAlpha(halfLifeDuration, collectInterval);
            Assert.True(alpha >= expectedAlpha - 0.001 && alpha <= expectedAlpha + 0.001);
        }