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Coefficient of Variation

Finds out the coefficient of variation of grouped data.

Submitted By: atik97

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Views: 572

Language: Python

Last Modified: February 20, 2009

Snippet

from math import *
from Numeric import *
n=input("Enter number of classes:")
h=input("Enter class interval:")
af=zeros(n,Float) #assigning empty array
ax=zeros(n,Float) #assigning empty array
sum_f=0
sum_x=0
sum_fx=0
sum_dd=0
for i in range(n):
print "Enter values for class %s"%(i+1)
l=input("Lower limit:")
f=input("Frequency:")
u=l+h #upper limit
x=(l+u)/2 #mean of lower & upper limit
sum_x=sum_x+x #cumulative sum of x
fx=f*x #product of frequency & mean value of a class
sum_fx=sum_fx+fx
ax[i]=x #assigns x to array
af[i]=f #assigns frequency to array
sum_f=sum_f+f #cumulative sum of frequency
mx=sum_fx/sum_f #mean value of given data group
for i in range(n):
dn=ax[i]-mx #deviation about mean
dd=af[i]*pow(dn,2)
sum_dd=sum_dd+dd
sd=sqrt(sum_dd/sum_f) #standard deviation
cv=(sd*100)/mx #coefficient of variation
print "The coefficient of variation is %s"%cv

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