[SciPy-user] Strange result from "scoreatpercentile"

hecvillaf at yahoo.com hecvillaf at yahoo.com
Fri Feb 11 11:50:39 CST 2005


Hi!
I'm trying to get some quartiles from a distribution
with scoreatpercentile. But it doesn't match with the
values I get from R (which seems pretty correct).
Any suggestions? Thanks!
-Hector

At Python:
#----------------------------------#
>>> vals = [342, 354, 1, 11, 31, 352, 323, 297, 29, 6,
376, 335, 354, 305, 311, 14, 15, 351, 352, 310, 329,
331, 2, 7, 393, 324, 333, 408, 204, 8, 20, 370, 300,
307, 357, 77, 8, 3, 305, 305, 309, 231, 19, 11, 37,
28, 13, 15, 11, 10, 19, 1, 331, 340, 308, 305, 314,
12, 20, 404, 427, 395, 373, 331, 27, 7, 354, 380, 394,
350, 340, 13, 15, 266, 401, 328, 415, 349, 22, 19,
364, 350, 312, 342, 303, 8, 21]
>>> scipy.stats.scoreatpercentile(vals,25)
-131.91357142857143
>>> scipy.stats.scoreatpercentile(vals,75)
344.62076923076927
#----------------------------------#

At R
#----------------------------------#
> summary(vals)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
    1.0    19.0   305.0   212.7   349.5   427.0 
#----------------------------------#


		
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