定义数据
x<-c(3,4,3.5, 2.5,2)
y<-c(30,25,20, 35,40)
计算 variance
v1 =sum((x-mean(x))^2)/(5-1)
v2 =sum((y-mean(y))^2)/(5-1)
计算 standard deviation
s1 =sqrt(v1)
s2 =sqrt(v2)
计算 covariance
cov1 = sum((x-mean版权声明：本文为Mrrunsen原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。