[Gretl-users] sorry, learning hansl question

If you can figure out the iffy psuedo-psuedocode below, I'm trying to run 1 ols regression over 4 different date ranges (so total 4 regressions) with 1 dependnet variable and 1 independant variable.. but I want to run a kpss test on both the depvar and indvar before doing the regression for each date range, then utilize either the variable or its fiorst-differenced version depending on the results of the kpss (at 5%, hopefully). Can this be done in hansl? start_yr = 1855 1860 1865 1870 end_yr = 1894 1899 1904 1909 ## get MyDepVar and myIndVar from file, then for i in start_yr, end_yr smpl start_yr end_yr kpss 3 myDepVar ## and capture results if stationary = True: tempDepVar = MyDepVar else: tempDepVar = d_MyDepvar kpss 3 myIndVar ## and capture results if stationary = True: tempIndVar = myIndVar else: tempIndVar = d_myIndVar ols tempDepVar tempIndVar -- Best regards, Timothy M. Nall Assistant Professor National Quemoy University Kinmen, Taiwan