72 lines
2.1 KiB
C#
72 lines
2.1 KiB
C#
/*
|
|
* C# Program to Find the Standard Deviation of a Set of Given Numbers
|
|
*/
|
|
using System;
|
|
using System.Collections.Generic;
|
|
namespace SampleApp
|
|
{
|
|
internal class Program
|
|
{
|
|
private static void Main()
|
|
{
|
|
List<double> number = new List<double> { 1, 2, 3, 4, 5, 6 };
|
|
double mean = number.Mean();
|
|
double variance = number.Variance();
|
|
double sd = number.StandardDeviation();
|
|
Console.WriteLine("Mean: {0} , Variance: {1} , SD: {2} ", mean, variance, sd);
|
|
Console.ReadKey();
|
|
}
|
|
}
|
|
public static class list
|
|
{
|
|
public static double Mean(this List<double> values)
|
|
{
|
|
return values.Count == 0 ? 0 : values.Mean(0, values.Count);
|
|
}
|
|
|
|
public static double Mean(this List<double> values, int start, int end)
|
|
{
|
|
double s = 0;
|
|
for (int i = start; i < end; i++)
|
|
{
|
|
s += values[i];
|
|
}
|
|
return s / (end - start);
|
|
}
|
|
|
|
public static double Variance(this List<double> values)
|
|
{
|
|
return values.Variance(values.Mean(), 0, values.Count);
|
|
}
|
|
|
|
public static double Variance(this List<double> values, double mean)
|
|
{
|
|
return values.Variance(mean, 0, values.Count);
|
|
}
|
|
|
|
public static double Variance(this List<double> values, double mean, int start, int end)
|
|
{
|
|
double variance = 0;
|
|
for (int i = start; i < end; i++)
|
|
{
|
|
variance += Math.Pow((values[i] - mean), 2);
|
|
}
|
|
int n = end - start;
|
|
if (start > 0) n -= 1;
|
|
return variance / (n);
|
|
}
|
|
public static double StandardDeviation(this List<double> values)
|
|
{
|
|
return values.Count == 0 ? 0 : values.StandardDeviation(0, values.Count);
|
|
}
|
|
public static double StandardDeviation(this List<double> values, int start, int end)
|
|
{
|
|
double mean = values.Mean(start, end);
|
|
double variance = values.Variance(mean, start, end);
|
|
return Math.Sqrt(variance);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
Mean : 3.5 Variance : 2.916666666667 S.D = 1.7078251256993 |