[Gretl-users] formula of Gini-coefficient

[Paar David]

Hello!


I would like to inform, which formula of Gini-coefficient is used by Gretl.
Thank you!

David Paar

[Allin Cottrell]

Post by Paar David
I would like to inform, which formula of Gini-coefficient is
used by Gretl. Thank you!

It's calculated as per the account given on Wikipedia for "a
population uniform on the values y_i, i = 1 to n, indexed in
non-decreasing order (y_i <= y_{i+1})". That is,

G = [(2 * sum(i * y_i)) / (n * sum(y_i))] - [(n + 1)/n]

This is equivalent to the next formula given on Wikipedia,
expressed in terms of a discrete probaility function f(y).

Allin Cottrell