Improved EWMA schemes for monitoring the ratio of two normal random variables
Xuelong Hu,
Yitian Zhao,
Ali Yeganeh
et al.
Abstract:Monitoring the ratio of two normal random variables, which is usually denoted as RZ, is one of the most important directions in statistical process control (SPC). In production scenarios, when the product specification is related to the relative ratio of two components in a mixture, or when the ratio represents a property of the product, or the difference between a product's quality measurement before and after an operation (such as a chemical reaction), the product quality can be improved by applying monitori… Show more
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