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This study aims to develop a joint probability function of peak ground acceleration (PGA) and cumulative absolute velocity (CAV) for the strong ground motion data from Taiwan. First, a total of 40,385 earthquake time histories are collected from the Taiwan Strong Motion Instrumentation Program. Then, the copula approach is introduced and applied to model the joint probability distribution of PGA and CAV. Finally, the correlation results using the PGA‐CAV empirical data and the normalized residuals are compared. The results indicate that there exists a strong positive correlation between PGA and CAV. For both the PGA and CAV empirical data and the normalized residuals, the multivariate lognormal distribution composed of two lognormal marginal distributions and the Gaussian copula provides adequate characterization of the PGA‐CAV joint distribution observed in Taiwan. This finding demonstrates the validity of the conventional two‐step approach for developing empirical ground motion prediction equations (GMPEs) of multiple ground motion parameters from the copula viewpoint. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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条件估值法(Contingent valuation method,CVM)在评价环境服务产品中起着不可替代的作用。通过对CVM的信度、效度、置信度、质量控制方面进行探讨,并对Logistic回归模型进行的改进,研究结果显示:(1)通过科学的问卷设计和规范操作,严格调研的质量控制可以有效地克服CVA法的不足,减少主观随意性对访谈结果的干扰。(2)质量控制方法主要通过控制信度、效度、置信度、问卷有效性、数据质量和调研员质量来实现,数据质量保障主要通过第一,抽样环节注意随机性和调查样本的代表性。第二,调研员和质量监督员的培训。第三,检验和回访。第四,调查后的质量控制,主要注重调查问卷的登记与编码和数据录入的质量控制。第五,资料整理质量控制,资料获取和整理后由质量控制人员、专家检验调查质量,发现问题,采取适当的补救措施。通过控制质量,保证了问卷调研的可信度。(3)蚌埠居民年支付意愿为每户9.35元/月,全年支付意愿总额为7 831.56万元人民币。(4)不同的收入段相关性又呈现差异性,年收入15 000~30 000元的公务员、教师、律师、高薪企业工人、军人支付意愿较高。 相似文献
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