«  
  »

Python 自建标准差函数

def stdDeviation(a):
l=len(a)
m=sum(a)/l
d=0
for i in a:

d+=(i-m)**2
return (d*(1/l))**0.5

a=[5,6,8,9]
print(stdDeviation(a))
========
1.5811388300841898

August 22nd, 2012 | Tags: | Category: 脚本语言

Leave a Reply

  

  

  

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>