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Measuring uncertainty in discrete choice travel demand forecasting models

机译:在离散选择旅行需求预测模型中测量不确定性

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In transportation projects, uncertainty related to the difference between forecast and actual demand is of major interest for the decision-maker, as it can have a substantial influence on the viability of a project. This paper identifies and quantifies discrete choice model uncertainty, which is present in the model parameters and attributes, and determines its impact on risk taking for decision-making applied to a case study of the High-Speed Rail project in Portugal. The methodology includes bootstrapping for the parameter variation, a postulated triangular distribution for the mode-specific input and a probabilistic graphical model for the socio-economic input variation. In comparison to point estimates, the findings for mode shift results in a wider swing in the system, which constitutes valuable information for decision-makers. The methodology, findings and conclusions presented in this study can be generalized to projects involving similar models.
机译:在运输项目中,与预测需求和实际需求之间的差异相关的不确定性是决策者的主要兴趣,因为它可能对项目的可行性产生重大影响。本文确定并量化了模型参数和属性中存在的离散选择模型不确定性,并确定了其对风险决策的影响,并将其应用于葡萄牙高铁项目的案例研究。该方法包括用于参数变化的自举,用于模式特定输入的假定三角形分布以及用于社会经济输入变化的概率图形模型。与点估计相比,模式转换的结果导致系统波动更大,为决策者提供了有价值的信息。这项研究中提出的方法,发现和结论可以推广到涉及类似模型的项目。

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