Ignacio Thank you very much. I had not answered before because I live in Cuba y I have not access to the internet, so I had to wait until a friend found the function for me. As I can see this function (Tramolin) works only for Outlier detection/correction and missing data interpolation, and it is not exactly a script. Is any script which makes the same process that produces the interaction with the gretl windows for Tramo/Seats? I mean, I would like to obtain the seasonal factors, the trend-cycle and the irregular factors, parting from a script that would be part of one script larger which is intended to forecast and make conjuncture analysis. Thanks again for your time and patience Eduardo Message: 4 Date: Wed, 26 Sep 2012 13:57:52 +0200 From: Ignacio Diaz-Emparanza <ignacio.diaz-emparanza(a)ehu.es&gt; Subject: Re: [Gretl-users] TRAMO/SEATS To: Gretl list <gretl-users(a)lists.wfu.edu&gt; Message-ID: <5062EDC0.5070305(a)ehu.es&gt; Content-Type: text/plain; charset="iso-8859-1" On 26/09/12 01:09, Miviam wrote: You may search in the manual for the function 'deseas' or have a look at my function pakage 'tramolin' which may be a little outdated but it is a good example on how to interact via the shell with an external program (you may find it in /File/Function files/On server).