[SciPy-user] scipy.stats.percentileofscore : something strange

Matthieu Brucher matthieu.brucher@gmail....
Thu Dec 13 04:24:09 CST 2007


2007/12/13, Samuel GARCIA <sgarcia@olfac.univ-lyon1.fr>:
>
>  Hi all,
> I found something strange in scipy.stats.percentileofscore
> In [1]: from scipy import *
> In [2]: a = rand(10000)
> In [3]: stats.percentileofscore(a,.2)
> Out[3]: 20.0157565073
>          This OK.
> In [4]: stats.percentileofscore(a,.0002)
> Out[4]: 102.898311442
>             This is strange !!!!!
>
>
This may be a bug


In [5]: stats.percentileofscore(a,1.4)
> ---------------------------------------------------------------------------
> <type 'exceptions.IndexError'>            Traceback (most recent call last)
> */home/sgarcia/*<ipython console> in <module>()
> /usr/lib/python2.5/site-packages/scipy/stats/stats.py in
> percentileofscore(a, score, histbins, defaultlimits)
>     942     cumhist = np.cumsum(h*1, axis=0)
>     943     i = int((score - lrl)/float(binsize))
> --> 944     pct =
> (cumhist[i-1]+((score-(lrl+binsize*i))/float(binsize))*h[i])/float(len(a))
> * 100
>     945     return pct
>     946<type 'exceptions.IndexError'>: index out of bounds
>                This does not work...
>
>
I expect this to raise this exception, you cannot take a percentile outside
[0, 1] (1.4 = 140%)

Matthieu
-- 
French PhD student
Website : http://matthieu-brucher.developpez.com/
Blogs : http://matt.eifelle.com and http://blog.developpez.com/?blog=92
LinkedIn : http://www.linkedin.com/in/matthieubrucher
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