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The probability density function for a beta distribution with parameters a and b (a, b > 0) is of the form:B(x; a, b) = c*x*(a-1)*(1-x)(b-1) where 0 <= x <= 1.

c is a constant such that the integral is 1 and it can be shown that c = G(a+b)/[G(a)*G(b)] where G is the Gamma function.

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Q: What is the beta distribution formula?
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Is the beta distribution is a special case of dirichlet distribution?

In a sense.Beta distributions are the marginal distributions of the Dirichlet distribution.


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