Hi I have the below results. I would like to make sure I read correctly Test with constant and time trend T=27 hypothesis of unit root : a=1 model : (1-L) y = b0 + b1*t + (a-1) * y(-1) + ... + e Coeff. autocorrelation of 1st order for e : -0.012 Estimated value of (a-1) : -0.65 Test statistic : tau_ct (1) = - 3.05 p. asymptotic critic : 0.11 => For a probability of 0.11 and n=27, the test statistic should be < -3.18 as per df distribution tables in order to be stationary. So this series is not stationary. Is this correct? Thanks a lot for the help! Mike ------------------------------------------------------------------------ Windows 7: Find the right PC for you. Learn more. <http://windows.microsoft.com/shop> ------------------------------------------------------------------------ _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users