[Gretl-users] about mahalanobis distance calculation in gretl

Hello, I want to ask a question about the mahalonobis distances calculation in gretl. I calculated the distances in Mathematica 7.0 and R, they are the same but totally different from gretl calculations. I am giving the data and the results in the below. Is this a bug or something i do not know about gretl calculation ? DATA v1 v2 1 13.0 20 2 14.0 25 3 12.5 40 4 12.0 22 5 12.5 33 6 12.0 35 7 11.0 21 8 10.0 25 9 10.0 42 10 12.0 30 11 10.5 35 12 10.0 28 13 11.0 25 14 9.0 40 15 11.5 33 Mahalanobis distances calculated in R and Mathematica 2.5713469 3.7042152 3.6085838 1.3058809 1.1389734 0.9227402 2.2294228 2.3743239 2.8943684 0.2110974 0.6510297 1.5641416 0.8572523 3.7788747 0.1877488 Mahalanobis distances calculated in gretl 1.603542 1.924634 1.899627 1.142751 1.067227 0.960594 1.493125 1.540884 1.701284 0.459453 0.806864 1.250656 0.925879 1.943933 0.433300 Assistant Prof. Baris Altayligil Department of Economics Istanbul University / Turkey _________________________________________________________________ Windows Live Hotmail: Your friends can get your Facebook updates, right from Hotmail®. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/...