[Scipy-tickets] [SciPy] #1213: stats.distributions: check currently unused numpy.random distributions
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Mon Jun 28 07:32:16 CDT 2010
#1213: stats.distributions: check currently unused numpy.random distributions
-------------------------+--------------------------------------------------
Reporter: josefpktd | Owner: somebody
Type: enhancement | Status: new
Priority: normal | Milestone: 0.8.0
Component: scipy.stats | Version: 0.7.0
Keywords: |
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from a quick comparison it looks like numpy's weibull is in scipy stats as
{{{
weibull_min = frechet_r_gen(a=0.0,name='weibull_min',
longname="A Weibull minimum",
shapes='c',extradoc="""
A Weibull minimum distribution (also called a Frechet (right)
distribution)
weibull_min.pdf(x,c) = c*x**(c-1)*exp(-x**c)
for x > 0, c > 0.
}}}
with "c" instead of "a" compared to numpy docs (lambda is the scale which
is handled separately in stat)
None of the distributions in scipy.stats uses the random numbers from
numpy.random.weibull (at least based on a quick search in the
distributions module)
A quick check, similar to the example in the numpy docstring or running
kstest should show if numpy weibull and frechet_r are the same.
frechet_r doesn't have a _rvs defined, so we should check whether we
can add numpy's weibull to it.
Also this means that several random variables in numpy random are not
tested for correctness.
--
Ticket URL: <http://projects.scipy.org/scipy/ticket/1213>
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