On Thu, 29 Mar 2012, Bulent Erdemir wrote: > I'd like to create a series of which an observation will refer to (or will > be calculated using) the previous observation of the same series. > > For example, I want to end up with a series like below: > > 0 > 5 > 10 > 15 > 20 > 25 > 30 > > Is it possible to create this series with a command similar to: > > series s = s(-1) + 5 > > (Of course, this series can be generated by a formula like obs * 5 but this > is not what I meant.) > > In such a command, one observation will be calculated by a function which > receives the previous observation. > > The command above wouldn't compile with error "The symbol 's' is undefined" > because at the time of the declaration there's no variable as s. > > Could you recommend a solution ? Yes, define s first: nulldata 10 series s = 0 s = s(-1) + 5 print s --byobs Allin Cottrell _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users