[Gretl-users] Goldfeld-Quandt heteroscedasticity test

Dear all Is there a possibility to perform this test manually? Step 1: Rank the observations according to the values to Xi, beginning with the lowest value Step 2: Omit c central observations Step 3: Fit separate OLS regressions to the first (n-c)/2 observations and the last (n-c)/2 observations Would it be possible to complement gretl menu with this test? Thank you very much Raul Gimeno