It is crucial to understand the proper variance estimator in statistical process control (SPC) when you are trying to answer the questions on the process behavior both in the short term and the long term. In this paper we will discuss various variance estimators including their calculation using range and/or range squares, their potential use in SPC, their similarities and differences.
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Holmes, D. & Mergen, A. E. (2005). Integrating several variance estimators. Paper presented the 2005 Northeast Decision Sciences Institute Annual Meeting, Philadelphia, PA, March 2005.
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