Sorry Allin, I know you are very busy know with the arima code, but I discovered something broken in the OLS graphing code that should be corrected. With for example data3-6.gdt, if I run an OLS regression of Ct vs Yt, and, in the model output window, I select "graphs/fitted, actual plot/against Yt", I obtain the incorrect plot you have in the attachment. This was with gretl for Windows in English (snapshot build 02/17/2006). I tried the same thing with Linux (official 1.5.0 version) and the result was the same with gretl in Spanish, but if I try it with "gretl --english" the graph plotted is correct. -- Ignacio Díaz-Emparanza Dpto. de Economía Aplicada III (Econometría y Estadística) UPV-EHU