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Project management under uncertainty beyond beta: The generalized bicubic distribution

机译:Beta以外的不确定性下的项目管理:广义双三次分布

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The beta distribution has traditionally been employed in the PERT methodology and generally used for modeling bounded continuous random variables based on expert’s judgment. The impossibility of estimating four parameters from the three values provided by the expert when the beta distribution is assumed to be the underlying distribution has been widely debated. This paper presents the generalized bicubic distribution as a good alternative to the beta distribution since, when the variance depends on the mode, the generalized bicubic distribution approximates the kurtosis of the Gaussian distribution better than the beta distribution. In addition, this distribution presents good properties in the PERT methodology in relation to moderation and conservatism criteria. Two empirical applications are presented to demonstrate the adequateness of this new distribution.
机译:Beta分布传统上已在PERT方法中采用,通常用于根据专家的判断对有界连续随机变量进行建模。当假定β分布为基础分布时,无法从专家提供的三个值中估算四个参数已引起广泛争议。本文提出了广义双三次分布作为β分布的一个很好的替代方法,因为当方差取决于模式时,广义双三次分布比β分布更好地近似了高斯分布的峰度。此外,这种分布在PERT方法论中相对于适度和保守主义标准具有良好的属性。提出了两个经验应用,以证明这种新分布的适当性。

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