private FunctionSeries calculateLinearRegression(List<DataPoint> points)
        {
            //Y = bx + a

            double avgX = 0;
            double avgY = 0;
            double xySum = 0;
            double xSumSquared = 0;

            int n = points.Count;

            foreach (var item in points)
            {
                avgX += item.X;
                avgY += item.Y;
                xySum += item.X * item.Y;
                xSumSquared += Math.Pow(item.X, 2);
            }

            avgX = avgX / n;
            avgY = avgY / n;

            double b = (xySum - n * avgX * avgY) / (xSumSquared - n * Math.Pow(avgX, 2));
            double a = avgY - b * avgX;

            Func<double, double> func = (x) => b * x + a;

            return new FunctionSeries(func, -200, 200, 0.5);
        }