public static double DeLongVariance(double[] positiveAccuracies, double[] negativeAccuracies) { double[] Vx = positiveAccuracies; double[] Vy = negativeAccuracies; double varVx = Vx.Variance(); double varVy = Vy.Variance(); return varVx / Vx.Length + varVy / Vy.Length; }