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指数分布


指数分布

指数分布用于描述下一个事件发生之前的时间,例如故障/成功等。

它有两个参数

scale - 速率的倒数(参见泊松分布中的 lam),默认为 1.0。

size - 返回数组的形状。

示例

为具有 2.0 比例和 2x3 大小的指数分布提取样本

from numpy import random

x = random.exponential(scale=2, size=(2, 3))

print(x)
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指数分布的可视化

示例

from numpy import random
import matplotlib.pyplot as plt
import seaborn as sns

sns.distplot(random.exponential(size=1000), hist=False)

plt.show()

结果

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泊松分布和指数分布之间的关系

泊松分布处理的是一段时间内事件发生的次数,而指数分布处理的是这些事件之间的时间。



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