Document Type

Article

Date of Original Version

2009

Department

Finance

Abstract

In this article, we compare the statistical properties of , , and RWAV methods for estimation of variance of a process for quality control purposes. We investigate effects of non-normality for different estimators. Our results indicate that RWAV gives the best estimates of the standard deviations for both normal and non-normal processes. We recommend the construction of control charts with RWAV.

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