On Thu, 31 May 2007, andreas.karlsson(a)ltv.se wrote:
Dear gretl developers,
Here is a short (well, maybe not that short) wish list of improvements for
gretl that I hope can be implemented:
1. For the genr command, add a function for computing the factorial, i.e.
We have the gamma function for that.
2. For Tools > Statistical tables: Add tabs for
(a) Poisson distribution
(b) binomial distribution
Yes, that would be useful.
3. In Tools > Test statistic calculator: Add
(a) the possibility for using continuity correction for the one sample
proportion test by checking a check box
(b) a new tab for calculating a Z-test for comparing two counts (assuming
that the counts are large enough for the normal approximation to the
Poisson to apply)
(c) a new tab for calculating ANOVA for comparison of K means
4. In Tools > Nonparametric tests: Add new tabs for calculating
(a) Friedman’s test (the K sample extension of the sign test)
(b) Kruskal-Wallis test (the K sample extension of the Wilcoxon rank sum
It would be very helpful if you could send a script that does these via
existing gretl commands to me or to Allin or both (or better still, to the
list). Allin and I are working on substantial additions to the code in
several areas, and it would help enormously if you could work out an
algorithm in advance.
5. For Tools > Probability distributions: Add
(a) a tab for the gamma distribution
(b) the possibility to choose the mean and standard deviation of the normal
6. In View > Correlation matrix add a check box for also
7. For View > Principal components: Add the possibility to plot
by checking a check box
Do you mean a graph of the eigenvalues? That would be nice to have too.
8. For View > Cross tabulation, please
(a) add that Fisher's exact test is given as default for 2x2 contingency
(b) add to the GUI radio buttons for the options --row (display row
percentages) or --column (display column percentages), and a check box for
the option --zeros (display zero entries)
(c) add an option to save the contingency table (without the marginal
totals) as a matrix
Agreed. For (c), we'd have to specify a corresponding "genr" function.
Would something like
matrix P = table(var1, var2)
9. For Add > Random variables
(a) Change the GUI to look like the one in Tools > P-value finder, i.e.
with tabs for the different distributions and text entry boxes for mean,
standard deviation, degrees of freedom, etc
(b) add the gamma distribution
10. In File > Export data, add options to export in
(a) Gnumeric file format
(b) LaTeX format
(b) could be done, (a) is a bit more tedious. But pardon me, what's wrong
11. Add an option to save a matrix in LaTeX format
See previous point. I should add that Allin and I briefly discussed the
possibility of adding two matrix commands from reading (writing) matrices
from (to) CSV files.
12. In the data window, there are currently three columns: “ID #”,
“Variable name” and “Descriptive label”. A new column showing if the
variable is to be treated as discrete or not would be useful.
I agree totally. But we have plans to change the user interface quite
substantially, so this item could become part of the new user interface.
I hope you will consider implementing these features
I hope we'll have time to!
Disclaimer: when I said "Agreed" above, that should read as "Yes, I agree
that this would be nice to have", not "Yes, I promise that this is going
in for the next release" :-)
Riccardo (Jack) Lucchetti
Dipartimento di Economia
Università Politecnica delle Marche