１７１７ - 経済統計練習帳

package math;
 
import org.apache.commons.math3.stat.correlation.Covariance;
 
 
class pro{
 
public static void main(String[] args) {
 
pro test=new pro();
}
 
pro(){
 
 
     double[] y=new double[4];
     double[] x=new double[4];
 
x[0]=1;
x[1]=2;
x[2]=3;
x[3]=4;
y[0]=5;
y[1]=2;
y[2]=3;
y[3]=4;
 
 
 
double d=new Covariance().covariance(x, y);
 
System.out.println(d);
 
 
 
}
 
}