SmoothingCubicSplineBaseErrorStandardDeviation Property

If the error standard deviation of the provided points is unknown, set this value to -1. Then a cross validating cubic spline is fitted to the data. If the error standard deviation is known and is equal for all points, set this value to the error standard deviation of the points. If the error standard deviation is known and different for each point, set this value to 1, and provide the error standard deviation for each point by calling Interpolate(IReadOnlyListDouble, IReadOnlyListDouble, Double, IReadOnlyListDouble).

public double ErrorStandardDeviation { get; set; }