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On the use of risk and decision analysis to support decision-making

机译:关于使用风险和决策分析来支持决策

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摘要

Risk analysis is always part of a decision context. While it is essential that risk analysts understand the decisional context of their work and results, this is often not very clear in risk analysis and engineering texts. Important knowledge for risk analysts are what tools are available for decision analysis and what the methodological and practical strengths and limitations of alternative approaches are. In the present paper, we discuss and give recommendations on the choice of approach to decision problems involving risk and uncertainty. Using an example from investment in risk reducing equipment on offshore helicopters, we illustrate how information from risk analysis is used to reach a decision, combined with cost-effectiveness indices, cost/benefit calculations and expected utility optimisation. Methodological differences are discussed. It is argued that, for risk related organisational decisions, presentations of consequence and uncertainties from the risk analysis should be highlighted, rather than synthesized measures of utility gains and losses. Results from decision analysis―cost/benefit as well as expected utility―are thus seen as secondary information and strictly as decision aid, rather than methods for prescription of choice. In a model for decision-making, this requires an explicit element of review and judgement by the decision maker. Cost/benefit calculations can provide results that are comprehendible, but will often cause disagreement, about the procedure and reference for the valuation of consequences. We argue that expected utility, although theoretically a more well founded approach, is seen to be of limited practical use.
机译:风险分析始终是决策环境的一部分。尽管至关重要的是,风险分析师必须了解其工作和结果的决策环境,但是在风险分析和工程文本中,这往往不是很清楚。风险分析师的重要知识是:哪些工具可用于决策分析,以及替代方法的方法和实践优势与局限性。在本文中,我们讨论并建议了涉及风险​​和不确定性的决策问题的方法选择。通过对海上直升机降低风险的设备进行投资的示例,我们说明了如何利用风险分析的信息来做出决策,并结合成本效益指数,成本/收益计算和预期的效用优化。讨论了方法上的差异。有人认为,对于与风险相关的组织决策,应强调风险分析的结果和不确定性,而不是综合效用损益的度量。因此,决策分析的结果(成本/收益以及预期效用)被视为辅助信息,严格地被视为决策辅助,而不是选择处方的方法。在决策模型中,这需要决策者进行明确的审查和判断。成本/收益计算可以提供可理解的结果,但通常会导致结果评估的程序和参考不一致。我们认为,期望的效用尽管在理论上是一种更完善的方法,但被认为具有有限的实际用途。

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