Re: [Gretl-users] Number of observations in OLS

I have 20 quarter observations from 1981:1 to 1990:4 When I run an OLS-estimation with three dummy variables yt = ß0 + ß1*t + ß2 *D2 + ß3 *D3 + ß4 *D4 + ut I get a result with the titel « Model x : OLS, using observations 1986 :2-1990 :2 (T17). » It is not clear to me why Gretl takes 17 observations instead of 20 to run the OLS estimation. Thank you in advance Raul ------------------------------------------------------------------------ _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users