using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Blog.Framework.Utility
{
public static class Statistics
{
public static double Mean(IEnumerable values)
{
double sum = 0;
int count = 0;
foreach (double d in values)
{
sum += d;
count++;
}
return sum / count;
}
public static double StdDev(IEnumerable values, out double mean)
{
mean = Statistics.Mean(values);
double sumOfDiffSquares = 0;
int count = 0;
foreach (double d in values)
{
double diff = (d - mean);
sumOfDiffSquares += diff * diff;
count++;
}
return Math.Sqrt(sumOfDiffSquares / count);
}
public static double StdDev(IEnumerable values, out double mean)
{
List converted = new List();
foreach (T value in values)
{
converted.Add(Convert.ToDouble(value));
}
return StdDev(converted, out mean);
}
public static double StdDev(IEnumerable values)
{
double mean;
return StdDev(values, out mean);
}
}
}