[SciPy-dev] status of stats.distributions

Charles R Harris charlesr.harris@gmail....
Sun Nov 16 23:38:27 CST 2008


On Sun, Nov 16, 2008 at 10:24 PM, <josef.pktd@gmail.com> wrote:

> I finished with the basic cleanup of scipy.stats.distribution.
>
> All generic methods work now, all distributions (except logser.rvs) pass
> the
> basic tests for the given parameter values. Test coverage according to
> figleaf is about 91%.
>
> There are some remaining problems:
>
> Entropy and fit test for the continuous rv are not included
> in the test suite. The entropy integration fails for 6 (out of more than
> 80)
> continuous distributions and returns nans, I haven't looked at this in
> detail.
> Also the entropy test only checks for nan, I didn't find a quick, general
> test
> for the numerical correctness of the entropy calculation.
> The parameter estimation with fit also does not converge very well for
>  for some distribution with sample size up to 10000, and it takes pretty
> long to run.
>
> Some methods defined in the specific distributions don't work
> correctly, but I did not find any mistakes or I could not find enough
> information of the statistical properties of these distributions with
> googling or the bugs are outside of scipy.stats.
> I replaced these methods by their generic counterparts which
> work correctly although maybe slower. The skipped methods were
> renamed by appending "_skip " to the method name. If someone finds
> the correction, then any help is appreciated.
>
> All my tests are currently for chosen parameter values, but
> I know of a few cases that are broken for some parameter
> values that are in the valid (but maybe uncommon) range. I did
> quite a bit of fuzz testing earlier on, but don't have the time now
> to go over the remaining cases.
>
> Tickets 697, 758, 766 and my ticket 745 can be closed now.
> ticket 620, I would close as don't fix, but I'm not sure how
> important users would think this is.
> I also just fixed 769, which looks correct to me.
>

Can you close tickets? I think you should now be able to close these
yourself. Give it a shot.

<snip>

Chuck
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