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Assessing model equifinality for robust policy analysis in complex socio-environmental systems
Environmental Modelling & Software ( IF 4.8 ) Pub Date : 2020-08-30 , DOI: 10.1016/j.envsoft.2020.104831
T.G. Williams , S.D. Guikema , D.G. Brown , A. Agrawal

Equifinality—a situation in which multiple plausible explanations exist for a single outcome—presents a challenge for socio-environmental systems modeling. When equifinality is ignored in model calibration, subsequent policy analyses may mis-estimate the range of potential policy effects. In this paper, we present and demonstrate an approach—called DMC-RPA—for generating a set of diverse model calibrations (DMC) to enable more robust policy analysis (RPA). The optimization-based approach maximizes diversity in the model parameters and/or structural configurations to efficiently represent any equifinality in the model set. We demonstrate the approach for an agent-based model that is used to compare resilience-enhancing strategies in a smallholder farming system. Results over the set of diverse model calibrations demonstrate consistent policy effects, enabling stronger conclusions than a single model analysis. Going forward, this approach can be applied in the development of socio-environmental systems models to facilitate more robust policy analysis and inference.



中文翻译:

评估模型均衡性以在复杂的社会环境系统中进行可靠的政策分析

均等性(对于单个结果存在多种合理解释的情况)对社会环境系统建模提出了挑战。当模型校准中忽略等价性时,后续的策略分析可能会错误估计潜在的策略影响范围。在本文中,我们介绍并演示了一种称为DMC-RPA的方法,该方法用于生成一组不同的模型校准(DMC)以实现更强大的策略分析(RPA)。基于优化的方法最大程度地提高了模型参数和/或结构配置的多样性,以有效地表示模型集中的任何均等性。我们演示了一种基于代理的模型的方法,该模型用于比较小农农业系统中的弹性增强策略。一系列不同模型校准的结果显示出一致的政策效果,与单个模型分析相比,可以得出更强的结论。展望未来,这种方法可以应用于社会环境系统模型的开发中,以促进更可靠的政策分析和推断。

更新日期:2020-09-23
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