The Pitting Resistance Equivalent Number (PREN) is widely applied to assess pitting corrosion resistance of stainless steel, despite containing only a few compositional elements. A reformulation of the PREN was established by statistical analysis of a public pitting potential data set. Statistical pitfalls were identified and properly addressed by multiple imputation and principles from survival analysis, such as censoring and mixed effects. This statistical framework allowed for simultaneous inclusion of surface pretreatment and test environment next to alloy composition in an updated PREN. Comparison of Weibull and non-parametric baseline hazard functions indicate that pitting potentials might not be Weibull distributed.

中文翻译：

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通过报告的点蚀电位的比例风险生存模型更新抗点蚀当量数


抗点蚀当量数 （PREN） 广泛用于评估不锈钢的抗点蚀性，尽管仅包含少量成分元素。通过对公共进坑电位数据集进行统计分析，建立了 PREN 的重新制定。通过多重插补和生存分析原则（例如删失和混合效应）确定并正确解决了统计陷阱。该统计框架允许在更新的 PRE 中同时包含表面预处理和测试环境以及合金成分。Weibull 和非参数基线风险函数的比较表明，点蚀电位可能不是 Weibull 分布的。