On Tue, 18 Jan 2005, ibert wrote: This was originally done because we weren't so sure of the convergence properties of the algorithm we have (which isn't particularly sophisticated, nor fine-tuned fr ARMA models): if you want higher ARMA orders, you can download the source form CVS and apply the following patch (which sets the maximum to 6), but beware: it is VERY unusual to need ARMA models of order higher than (4,4) to model a series satisfactorily (we don't have seasonals yet, but that's another story). Index: plugin/arma.c =================================================================== RCS file: /cvsroot/gretl/gretl/plugin/arma.c,v retrieving revision 1.49 diff -u -r1.49 arma.c --- plugin/arma.c 25 Nov 2004 00:55:49 -0000 1.49 +++ plugin/arma.c 18 Jan 2005 22:10:06 -0000 @@ -30,6 +30,8 @@ #undef ARMA_DEBUG +#define MAX_ARMA_ORDER 6 + static void add_arma_varnames (MODEL *pmod, const DATAINFO *pdinfo) { int p = pmod->list[1]; @@ -391,8 +393,8 @@ if (list[0] < 4) err = 1; /* for now we'll accept ARMA (4,4) at max */ - else if (list[1] < 0 || list[1] > 4) err = 1; - else if (list[2] < 0 || list[2] > 4) err = 1; + else if (list[1] < 0 || list[1] > MAX_ARMA_ORDER) err = 1; + else if (list[2] < 0 || list[2] > MAX_ARMA_ORDER) err = 1; else if (list[1] + list[2] == 0) err = 1; /* remove const from list of regressors (ARMAX), since it Riccardo `Jack' Lucchetti Dipartimento di Economia Università di Ancona jack(a)dea.unian.it http://www.econ.unian.it/lucchetti