lorenz curve how to find cumulative percentage?

Lorenz curve is graphical measure of dispersion that measures the deviation of actual distribution from the line of equal distribution.

To understand the calculation of cumulative percentage, consider the data given below.  

Income100200400500800
No. of persons8070503020

 To calculate the cumulative percentage values, we first calculate the cumulative frequencies (by adding the successive values) and then calculate the concerned percentage values.

The cumulative percentage values for the given data is as follows.

IncomeCumulative Income

Cumulative Percentage of Income

=C.I/F×100

No. of PersonsCumulative Total

Cumulative Percentage of Totals

=C.F/F×100

1001005808032
200300 1570150 60
400700 3550200   80
5001200 6030230 92
8002000 10020250 100

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