Re: [Gretl-users] formula of Gini-coefficient
On Mon, 20 Apr 2009, Paar David wrote:
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