Date of Original Version
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.
Pan, Xia and Jarrett, Jeffrey E.(2009)'Estimating and Improving Control Limits with RWAV for Normal and Nonnormal Processes',Quality Engineering,21:1,72 — 78. doi: 10.1080/08982110802450769
Available at: http://dx.doi.org/10.1080/08982110802450769