Solving for quartile and decile using Python

Question

Is there a library for Python 2.7 that can solve quartiles and deciles. It seems that numpy doesn't have any functions for it. Can you give me a link if there are any. Thanks in advance! :D

You could use numpy.percentile to get quartiles and deciles. docs.scipy.org/doc/numpy-dev/reference/generated/… — Zero
– Zero, Commented Apr 6, 2015 at 13:13

Will Da Silva · Accepted Answer · 2021-06-17 19:27:09Z

13

Using np.percentile, you could try something like

>>> import numpy as np
>>> var = np.array([10, 7, 4, 3, 2, 1]) # input array
>>> np.percentile(var, np.arange(25, 100, 25)) # quartiles
array([2.25, 3.5 , 6.25])
>>> np.percentile(var, np.arange(10, 100, 10)) # deciles
array([1.5,  2. ,  2.5,  3. ,  3.5,  4. ,  5.5,  7. ,  8.5])

edited Jun 17, 2021 at 19:27

Will Da Silva

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answered Apr 6, 2015 at 13:19

Zero

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4 Comments

mway Over a year ago

Also worth checking out pandas.qcut, which will split your array up into whatever quantiles you specify.

pltrdy Over a year ago

That seems incorrect to me. There should be 3 quartiles (i.e. 25%, 50%, 75%) and 9 deciles (i.e. 10%, 20%, ..., 90%). Here the first value of both is the minimum because you start np.arange at 0 use instead: np.percentile(var, np.arange(25, 100, 25)) # quartiles and np.percentile(var, np.arange(10, 100, 10)) # deciles

JeeyCi Over a year ago

@ pltrdy: you're mistaken

JeeyCi Over a year ago

example @mway's_comment

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