矩估计E(x)=∫(-∞,+∞)f(x)xdx=θ/(1+θ)X'=Σxi/n=E(x)=θ/(1+θ)θ=x'/(1-x') ,其中Σxi/n最大似然估计f(xi.θ)=θ^n x1^(θ-1) x2^(θ-1).xn^(θ-1)lnL(θ)=nlnθ+(θ-1)ln(x1x2.xn)[lnL(θ)]'=n/θ+ln(x1x2...xn)=0θ=-n/ln(x1x2.xn)最大似然估计为θ=-n/ln(x1x2.xn)