Assessing Non-normally Distributed Processes by Interval Estimation of the Incapability Index Cpp

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题名:	Assessing Non-normally Distributed Processes by Interval Estimation of the Incapability Index Cpp
作者:	林碧川
贡献者:	工業工程與(工程)管理系
日期:	2009-06
上传时间:	2017-10-02 14:15:03 (UTC+8)
摘要:	Process capability indices have been widely used in the manufacturing industry. While most studies consider estimation of capability indices for normal processes, comparatively little is known about their behavior in non-normal settings. Greenwich and Jahr-Schaffrath (Int. J. Qual. Reliab. Manage. 1995; 12:58-71) introduced the incapability index Cpp to evaluate processes. In this paper, we explore the interval estimation of the incapability index Cpp for non-normally distributed processes by utilizing seven feasible methods. We further develop an efficient criterion, which is relative coverage, to evaluate the performance of the seven methods. Detailed discussion of simulation results for six non-normally distributed processes is presented. The results display that the bootstrap pivotal method developed by Wasserman (All of Statistics: A Concise Course in Statistical Inference. Springer Science, Business Media, Inc., 2004) is the best feasible method to estimate Cpp. An example is also demonstrated to illustrate how the method may be used in practice. Copyright © 2008 John Wiley & Sons, Ltd. (27 refs)
關聯:	Quality and Reliability Engineering International
显示于类别:	[工業工程與管理系(所)] 【工業工程與管理系所】期刊論文

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