时代Java

Java 计算（偏差

欢马劈雪

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计算（经偏差校正的样本）方差。

实例源码：

源代码：

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//package com.nowjava;/*from n o w  j a v a  . c o m*/

public class Main {

public static void main(String[] argv) throws Exception {

double[] v = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,

37.1234, 67.2344, 68.34534, 69.87700 };

System.out.println(variance(v));

}

/**

* Computes the (bias-corrected sample) variance.

public static double variance(double[] v) {

if (v.length > 1) {

final double m = mean(v);//N  o w  J a v a . c o m 提 供

double ans = 0.0;

for (int i = 0; i < v.length; i++)

ans += (v[i] - m) * (v[i] - m);

return ans / (v.length - 1);

} else

throw new IllegalArgumentException(

"Array length must be of 2 or greater.");

}

/**

* Computes the (bias-corrected sample) variance.

public static double variance(int[] v) {

if (v.length > 1) {

final double m = mean(v);

double ans = 0.0;

for (int i = 0; i < v.length; i++)

ans += (v[i] - m) * (v[i] - m);

return ans / (v.length - 1);

} else

throw new IllegalArgumentException(

"Array length must be of 2 or greater.");

}

/**

* Computes the mean.

public static double mean(double[] v) {

if (v.length == 0)

throw new IllegalArgumentException(

"Nothing to compute! The array must have at least one element.");

return (mass(v) / (double) v.length);

}

/**

* Computes the mean.

public static double mean(int[] v) {

if (v.length == 0)

throw new IllegalArgumentException(

"Nothing to compute! The array must have at least one element.");

return (mass(v) / (double) v.length);

}

/**

* Returns the sum of the elements of the array.

public static double mass(double[] v) {

double somme = 0.0;
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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