[python] 사분위 구하기

사분위 구하기

목적: Data를 순서대로 늘어놓았을 때 아래부터 지정한 percent의 값에 맞는 값을 산출한다.

from scipy import stats

code

github

def sample_stats():
    import numpy as np
    from scipy import stats

    fish_datas3 = np.asarray([1,2,3,4,5,6,7,8,9,10])

    num = 25
    print('{0}% = {1}'.format(num, stats.scoreatpercentile(fish_datas3, num)))

    num = 75
    print('{0}% = {1}'.format(num, stats.scoreatpercentile(fish_datas3, num)))

    print('-'*10)

    for i in range(13):
        num = i*10
        print('{0}% = {1}'.format(num, stats.scoreatpercentile(fish_datas3, num)))

 

결과 값

범위를 넘는 percent의 경우 아래와 같은 오류가 발생한다.

25% = 3.25
75% = 7.75
----------
0% = 1.0
10% = 1.9
20% = 2.8000000000000003
30% = 3.6999999999999997
40% = 4.6
50% = 5.5
60% = 6.3999999999999995
70% = 7.3
80% = 8.2
90% = 9.1
100% = 10.0
Traceback (most recent call last):
  File "C:/Users/mellowlee/Project_Lotto/Sample006/sample_scipy.py", line 26, in <module>
    sample_stats()
  File "C:/Users/mellowlee/Project_Lotto/Sample006/sample_scipy.py", line 20, in sample_stats
    print('{0}% = {1}'.format(num, stats.scoreatpercentile(fish_datas3, num)))
  File "C:\Users\mellowlee\python_project\venv\lib\site-packages\scipy\stats\stats.py", line 1820, in scoreatpercentile
    return _compute_qth_percentile(sorted_, per, interpolation_method, axis)
  File "C:\Users\mellowlee\python_project\venv\lib\site-packages\scipy\stats\stats.py", line 1832, in _compute_qth_percentile
    raise ValueError("percentile must be in the range [0, 100]")
ValueError: percentile must be in the range [0, 100]

Process finished with exit code 1