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概率权重矩法是一种估计统计分布参数的方法。本文根据不完全Γ函数在无限区间积分,推导了P-III分布参数的S函数的计算公式。通过现有计算公式比较,其计算结果具有较高的计算精度,避免了的大量的数值积分计算。文中公式只要借助于计算编程进行求解,给定超几何函数项一定的截断误差,其运算具有较高的运行速度。文中计算公式是一种P-III分布参数S函数的计算途径。
Probabilistic Weights The Moment Method is a method of estimating statistical distribution parameters. Based on the integral of the incomplete Γ function in an infinite interval, this paper deduces the formula of the S-function of P-III distribution parameter. Compared with the existing calculation formula, the calculation result has higher calculation precision and avoids a large amount of numerical integral calculation. As long as the formulas in this paper are solved by means of computational programming, given a certain truncation error of the hypergeometric function term, the operation of the formula has higher running speed. The calculation formula in this paper is a calculation method of P-III distribution parameter S function.