[Gretl-users] Ljung-Box Q question

Hi, I am testing the residuals from a regression for autocorrelation (for an assignment at school), and the correlogram in Gretl gives me a different value for the Ljung-Box Q than i'd expect. I'm using a maximum lag of 2, and the autocorrelation coefficients are 0,7452 and 0,5167 respectively. These are the same values that Eviews produces, but Gretl gives the Ljung-Box Q as 17,5104, while Eviews gives 19,388, and my own calculations gives 19,386, using the formula found in Gujarati's Basic Econometrics, fourt edition, page 813. Does Gretl use a different formula to calculate the Q value? I'm using version 1.5.0, but i can't find anything about this in the release notes for the later versions, so i'm assuming it might still be a problem, if it is a problem and not some mistake or misunderstanding on my part. As i'm new to this list, i might as well briefly introduce myself. I'm a student at Uppsala University in Sweden, currently studying economics and statistics. Also, thank you Allin Cottrell for a great program! /Adrian Adermon