[SciPy-user] Bug in stats?

David Huard david.huard at gmail.com
Tue Jan 24 09:16:41 CST 2006


Hi,

I get the same problem, and had it with previous versions of scipy too.
Also, I just found out that the fit method of the genextreme distribution
returns [1.,0.,1.] systematically, no matter what the data set is.

For example,
>>> z = genextreme.rvs(.15, loc=3.8, scale=.17, size=30)
>>> z
array([3.57489347,  3.88036819,  3.78173901,...])
>>> genextreme.fit(z)
array([ 1.,  0.,  1.])

Is it a bug or the stats package is not completed yet ?

Thanks

David

2006/1/19, Paul Ray <Paul.Ray at nrl.navy.mil>:
>
> Hi,
>
> I'm getting nan when I try to calculate the stats on any distribution
> In [1]: import scipy
> Overwriting fft=<function fft at 0x1458730> from scipy.fftpack.basic
> (was <function fft at 0x14478b0> from numpy.dft.fftpack)
> Overwriting ifft=<function ifft at 0x1458770> from
> scipy.fftpack.basic (was <function inverse_fft at 0x14478f0> from
> numpy.dft.fftpack)
>
> In [2]: scipy.stats.norm.stats()
> Out[2]: (nan, nan)
>
> In [3]: scipy.__version__
> Out[3]: '0.4.4'
>
> I get nan's for all distributions I have tried and the loc and scale
> parameters don't seem to help.
>
> Is this a bug or am I using it wrong?
>
> Thanks,
>
> -- Paul
>
> --
> Dr. Paul S. Ray              E-mail: Paul.Ray at nrl.navy.mil
> Naval Research Laboratory    WWW   : http://xweb.nrl.navy.mil/
> personnel/paulr/
> Code 7655                    Phone : (202) 404-1619
> Washington, DC 20375         AIM   : NRLPSR
>
>
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> SciPy-user at scipy.net
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>
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