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Hi, I'm wondering whether somebody can help me? I'm currently doing some work using beta distributions but I have I have been given what to me seems a non-standard parametrisation for its PDF. Comparing it to the standard pdf they do not look equivalent and I was wondering whether anyone could tell me what the consequences of the differences in the formulae are? Firstly the standard formula, f(x) = [Gamma(alpha+beta)/Gamma(alpha)Gamma(beta)]x^(alpha-1)(1-x)^(beta-1) and secondly the other formulation f(x) =[Gamma(alpha+beta)/Gamma(alpha)Gamma(beta)]x^(beta-1)(1+x)^(-alpha-beta) where alpha and beta are the shape parameters and Gamma is the standard Gamma function. Please relpy to [log in to unmask] Many thanks in advance Alastair