In this thesis some aspects of process capability analysis are considered. Process capability analysis deals with how to assess the capability of manufacturing processes. Based on the process capability analysis one can determine how the process performs relative to its product requirements or specifications. An important part within process capability analysis is the use of process capability ...

in many applications the quality of a process or product is best characterized and summarized by a functional relationship between a response variable and one or more explanatory variables. profile monitoring is used to understand and to check the stability of this relationship over time. therefore checking the capability of a profile seems essential. process capability indices have become very...

In this study, we process the quality of the product characteristics for unilateral specification, Many industrial products can be characterized as bigger-the-best type or smaller-the-best type. Quality characteristics and process yields of unilateral or bilateral specification products can be evaluated by using process capability indices. Process capability indices Cpl or, Cpu are utilized to ...

This study develops a novel procedure for measuring the process capability indices of a complete product with several quality characteristics. The p-values of the estimators of Cpl , Cpu , and Cpp, so that the process works at least 100(1−α)% of the time, are provided. An evaluation checklist is also given to determine whether the process’s potentiality and performance meet consumers’ expectati...

Process capability indices (PCIs) can be used as an effective tool for measuring product quality and process performance. In classic quality control there are some limitations which prevent a deep and flexible analysis because of the crisp definition of PCA‟s parameters. Fuzzy set theory can be used to add more flexibility to process capability analyses. In this study, the fuzzy X ba and MRx ba...

In today’s competitive business environment, it is becoming more crucial than ever to assess precisely process losses due to non-compliance to customer specifications. To assess these losses, industry is widely using process capability indices for performance evaluation of their processes. Determination of the performance capability of a stable process using the standard process capability indi...

The process capability indices are widely used by quality professionals as an estimate of process capability. The lower confidence limits of PCIs are difficult to be estimated by parametric methods for some non-normal distributed processes. The non-parametric but computer intensive Bootstrap techniques are utilized for these cases. The Percentile-t Bootstrap (PTB) method is used to estimate the...