As a generalization of the binomial distribution, if the probabilities of states 1 , 2, ..., k are p1 , p2 , ..., pk ( pi ≥ 0 , p1 + p2 + ... + pk = 1), then the probability of state i being taken r i times out of n ( r1 + r2 + ... + rk = n ) is This is called the multinomial distribution. It is exactly the form of ( p 1 + p 2 + ... + p k ) n expanded by the multinomial theorem. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
二項分布の一般化として,状態1,2,…,k をとる確率が p1 ,p2 ,…,pk のとき ( pi≧0 ,p1+p2+…+pk=1 ) ,n 回のうち i を ri 回 ( r1+r2+…+rk=n ) とる確率は になる。これを多項分布という。これはちょうど (p1+p2+…+pk)n を多項定理で展開した形になっている。 出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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