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Math Help - prove an equality

  1. #1
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    prove an equality

    hello
    negbinomial(x;k,θ)=k/x*binomial(k;x,θ)
    how i can prove it??
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  2. #2
    MHF Contributor matheagle's Avatar
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    what exactly does negbinomial(x;k,θ) mean?

    Is it P(X=k) for a NegBi?
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  3. #3
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    negbinomail(x;k,θ)=p(x-1,k-1)*θ^k *(1-θ)^(x-k);so that p(x-1,k-1)=combination of k-1 of x-1
    Negative binomial distribution - Wikipedia, the free encyclopedia
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