累積分布函數（cumulative distribution function）

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累積分布函數（cumulative distribution function）定義：對連續函數，所有小於等於a的值，其出現概率的和。F(a)=P(x<=a)

python statsmodels包支持計算和繪制累積分布函數

import numpy as np
import statsmodels.api as sm # recommended import according to the docs
import matplotlib.pyplot as plt

sample = np.random.uniform(0, 1, 50)
ecdf = sm.distributions.ECDF(sample)

#等差數列，用於繪制X軸數據
x = np.linspace(min(sample), max(sample))
# x軸數據上值對應的累計密度概率
y = ecdf(x)
#繪制階梯圖
plt.step(x, y)
plt.show()

　　

 

 

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