# [Scipy-tickets] [SciPy] #1288: stats streamlining obrientransform

SciPy Trac scipy-tickets@scipy....
Sun Sep 26 07:46:55 CDT 2010

```#1288: stats streamlining obrientransform
-------------------------+--------------------------------------------------
Reporter:  josefpktd    |       Owner:  somebody
Type:  enhancement  |      Status:  new
Priority:  normal       |   Milestone:  0.9.0
Component:  scipy.stats  |     Version:  0.7.0
Keywords:               |
-------------------------+--------------------------------------------------
loop over nobs can be removed, vectorized

{{{
>>> a = np.array([1, 1, 5, 0, 1, 2, 2, 0, 1, 4])
>>> nobsa = float(len(a))
>>> acent2 = (a-np.mean(a))**2;
>>> (nobsa*(nobsa-1.5)*acent2 - 0.5*acent2.sum(0)) /(nobsa-2.)/(nobsa-1.)
array([  0.41111111,   0.41111111,  12.68888889,   3.24444444,
0.41111111,  -0.06111111,  -0.06111111,   3.24444444,
0.41111111,   6.07777778])
>>> stats.obrientransform(a)
array([[  0.41111111,   0.41111111,  12.68888889,   3.24444444,
0.41111111,  -0.06111111,  -0.06111111,   3.24444444,
0.41111111,   6.07777778]])
}}}

Reference http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.80.9991

(I didn't read the entire paper)

--
Ticket URL: <http://projects.scipy.org/scipy/ticket/1288>
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