機率與機率分佈
事件
機率
隨機變數
機率分佈
機率密度函數:隨機變數值 和機率 之間的函數關係。
常態(機率)分佈 normal distribution (a.k.a 高斯分佈 Gaussian distribution)
refers to the standard deviation.
refers to the mean.
is a constant, respectively, the base of the natural log system and approximately equals to 2.718.
a constant with an approximate value of or 3.1416.
refers to the value of the random variable.
rnorm(n=10)
[1] -0.48200811 1.02070719 0.09263650 0.07460888 1.75003405
0.22843413
[7] -0.11792523 0.39054810 -0.35487301 -1.82808605
Poisson Distribution
針對計數資料 count data
trial 次數很多 (n 很大), 事件發生機率(P)很小時的二項分布。
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