On Tue, July 11, 2006 19:01, Sven Schreiber wrote:
3) In preferences/general, the choice between cholesky and QR could
maybe use a short comment what this is about (I guess it must relate to
how to solve (X'X)*beta = X'y ?)
You can find a good discussion of the QR algorithm in Davidson & MacKinnon
(1993): basically, Cholesky is cheaper numerically, whereas QR is more stable.
You're unlikely to see a difference unless you have regressors that are nearly
collinear.
4) Just a thought: maybe use 2sls instead of tsls, in analogy to
3sls,
and both "two" and "three" start with t.
I agree. The only drawback is, if we allow a command to start with a number,
that could make the parsing code more complex (Allin?)
5) I like the new menu structure; however, iirc there used to be one
menu less. Now the session menu is quite short, maybe make that a
submenu of file? (I haven't thought this through, but staying at 7 menus
would be better imho.)
I feel the same. Only, I'd put "Session" under "Utilities", which
has less
entries (and seems more pertinent to me).
7) Whether or not variables are (set to) discrete should be displayed
in
the main window (by means of a little symbol, or a letter). And for
discrete variables it would be nice to replace the histogram by a bar
diagram where the bars are visually separated.
I agree on both things. For the graph, it's not easy to produce horizontal
bars with gnuplot. However, have a look at the attached screenshot.
It is produced by
open greene22_2
discrete Z6
freq Z6
after applying this simple patch:
Index: lib/src/graphing.c
===================================================================
RCS file: /cvsroot/gretl/gretl/lib/src/graphing.c,v
retrieving revision 1.280
diff -u -r1.280 graphing.c
--- lib/src/graphing.c 10 Jul 2006 02:49:47 -0000 1.280
+++ lib/src/graphing.c 11 Jul 2006 20:30:51 -0000
@@ -2050,6 +2050,10 @@
return 1;
}
+ if (freq->discrete) {
+ fprintf(fp, "set boxwidth 0.75\n");
+ }
+
/* plot instructions */
if (use_boxes) {
if (gnuplot_has_style_fill()) {
Do you people like it? Allin, do you?
Riccardo "Jack" Lucchetti
Dipartimento di Economia
Facoltà di Economia "G. Fuà"
Ancona