Hello
Does anyone know the probability distribution of the sum of some
marginals of the
multinomial distribution?
Let X=(X1,X2,...,Xk) have a multinomial distribution with parameters n
and p=(p1,...,pk), with pi\ge 0 and \sum pi=1.
Given Y=Xi+Xl, with i\ne l, what is the probability distribution of Y?
What if instead of just 2 marginals, we have the sum of r marginals,
r=1,2,...,K-1?
Regards
Joaquim Costa
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