Re: [Gretl-users] A critical bug and a feature request
On Thu, 24 Sep 2009, Talha Yalta wrote:
I have been testing the improvements for model windows under
changing
subsampling options. Thanks to Allins recent work, this functionality
looks very nice and works smoothly in general. I also have some
suggestions and bugs to report:
1)- In the Edit menu for the model window, it could be useful to add
an option such as "restore model sample" to quickly reverting to the
subsample used by that model.
Could be nice, not very high priority.
2)- I understand disabling forecasts but don't see why gretl
disables
saving the residuals, fitted values etc. from a model just because the
current subsample is different. I think it is perfectly OK to save the
residuals based on the model subsample with the outside observations
having missing values After all, this is what gretl does when the
current subsample happens to match the model subsample.
This is problematic if the model was estimated on a subsample and
the dataset is also currently subsampled, but in a different way
from the model. But some possibilities may be worth exploring.
3)- A Bug: I have 2 models one is with n=100 and based on a dummy,
while the other is using a random subsample with n=200. After
estimating the second model, I return to the first one and gretl asks
me if I want to restore the sample. I say yes and now the sample size
is 60 instead of 100 (probably because gretl took the observations
only from the active random subsample of n=200 instead of the full
sample)...
Thanks for the report; fixed in CVS.
4)- The subsampling info at the bottom of the gretl main window
could
use some improvements. For example, when the sub sample is based on a
dummy, instead of just saying "current sample n = 100" it would be
nice if gretl said something like: "current sample based on dummy
<varname> (n = 100)" (The same thing for other subsampling options
such as random subsamples etc.)
Too much information to print at the bottom of the window. I've
added a menu item /Sample/Show status which shows some more detail
than the bottom-of-the-screen line. It doesn't yet show a
sampling criterion or anything of that sort -- that could maybe be
added later (it would require recording more dataset information
than we currently record).
I also have some other small bugs to report:
6)- Opening a new data set, all open windows are closed except for the
gnuplot graphs.
OK, that could cause trouble in some cases. The graph windows
should now close too.
7)- In the model specification window, when the "Set as
default"
option is checked, it becomes unchecked the next time (although the
dependent variable is set correctly and as expected)
OK, cosmetic. Will be fixed at some point.
8)- My system is Turkish and when I use gretl in English, the legend
for the OLS fitted line still uses commas as the decimal seperator.
I'm not in a position to test that. Do other people see that too?
(I.e. you're in a locale that uses the decimal comma, but you use
the GUI selector to run in English: what decimal separator
character do you see?)
9)- Also, when using gretl in Turkish, entering formula for a new
line
I need to use dot as the decimal seperator. If I use the comma sign in
the formula, gretl draws a wrong line and a differently wrong legend.
I think this issue was fixed a while ago.
I'm pretty sure that's as it always has been. The string is fed
straight to gnuplot and you have to use '.' as decimal separator.
Allin.