Hi Sven, Thank you for your reply. What I meant is that, e.g., if I create a list of the code of 50 states list statelist = AR MA PA ... I can save this statelist somewhere. Next time I do not need to create this list again. I just retrieve it from the file. So, when I need to do the data of the population of the 50 state, I can just create a new list from it by typing list statepop = statelist suffix pop then I can get the state population variable list ARpop MApop PApop ... In the reverse case, if I get the list statepop from the variable names in from the population by state dataset, and I want to get the state code list from it, I can type List statelist = statepop strip pop Then I can get the state code list AR MA PA ... Anyway, I can save the lists I created for future manipulation and use, especially when they are very long lists. Can gretl allow doing that? Regards YiMin Chen ------------------------------ Message: 2 Date: Fri, 25 Sep 2009 14:51:35 +0200 From: Sven Schreiber <svetosch(a)gmx.net&gt; Subject: Re: [Gretl-users] Can gretl allow to save lists for future use To: Gretl list <gretl-users(a)lists.wfu.edu&gt; Message-ID: <4ABCBCD7.9020403(a)gmx.net&gt; Content-Type: text/plain; charset=UTF-8 Hi, not sure what you mean: it _is_ possible to save the list members to separate files and re-open them later on. But I admit that you would have to write a script for that I guess. Or do you mean you want to save the definition of a list as a kind of object in a gretl session file, instead of the values of the series in the list? I'm not sure if that's implemented. cheers, sven YiMin Chen schrieb: