在Java中怎么求方差和标准差
2017-04-08 · 百度知道合伙人官方认证企业
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Java求方差和标准差:
public class GetAverageandStandardDevition {
private int[] array = new int[10];
private int num = 10;
public int getRandomDigit() {
return (int) (Math.random() * 1000);
}
public void getTargetDigit() {
for (int i = 0; i < num; i++) {
array[i] = getRandomDigit();
System.out.println(array[i]);
}
}
//方差
public double getAverage(){
int sum = 0;
for(int i = 0;i < num;i++){
sum += array[i];
}
return (double)(sum / num);
}
//标准差
public double getStandardDevition(){
double sum = 0;
for(int i = 0;i < num;i++){
sum += Math.sqrt(((double)array[i] -getAverage()) * (array[i] -getAverage()));
}
return (sum / (num - 1));
}
public static void main(String[] args) {
GetAverageandStandardDevition gcs = new GetAverageandStandardDevition();
gcs.getTargetDigit();
System.out.println(gcs.getAverage() + " " + gcs.getStandardDevition());
}
public class GetAverageandStandardDevition {
private int[] array = new int[10];
private int num = 10;
public int getRandomDigit() {
return (int) (Math.random() * 1000);
}
public void getTargetDigit() {
for (int i = 0; i < num; i++) {
array[i] = getRandomDigit();
System.out.println(array[i]);
}
}
//方差
public double getAverage(){
int sum = 0;
for(int i = 0;i < num;i++){
sum += array[i];
}
return (double)(sum / num);
}
//标准差
public double getStandardDevition(){
double sum = 0;
for(int i = 0;i < num;i++){
sum += Math.sqrt(((double)array[i] -getAverage()) * (array[i] -getAverage()));
}
return (sum / (num - 1));
}
public static void main(String[] args) {
GetAverageandStandardDevition gcs = new GetAverageandStandardDevition();
gcs.getTargetDigit();
System.out.println(gcs.getAverage() + " " + gcs.getStandardDevition());
}
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