Statistical functions: Standard Deviation

     
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using System;
using System.Collections.Generic;
using System.Globalization;

namespace Subtext.Framework.Util
{
    /// <summary>
    /// Statistical functions
    /// </summary>
    public static class Statistics
    {

        public static double StandardDeviation(this IEnumerable<double> values, out double mean)
        {
            mean = values.Mean();
            double sumOfDiffSquares = 0;
            int count = 0;

            foreach(double d in values)
            {
                double diff = (d - mean);
                sumOfDiffSquares += diff * diff;
                count++;
            }

            return Math.Sqrt(sumOfDiffSquares / count);
        }
    }
}

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Statistical functions: Standard Deviation : Math « Development Class « C# / C Sharp

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