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3F→:謝謝~~我終於知道combn要怎麼用了orz05/11 16:22
1F推:Var(X)=E(X^2)-(E(X))^2 後面兩項直接用Y的分配算就出來了03/26 11:43
2F→:上面的Y我是指ΣYi, Yi iid exp(θ) so ΣYi~gamma(n,θ)03/26 11:45
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