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.

Date of creation, presentation, or exhibit



Presented at the 2005 Northeast Decision Sciences Institute Annual Meeting Proceedings, Philadelphia, PA, March 2005.

Copyright 2005 The Authors

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type

Conference Paper

Department, Program, or Center

Accounting (SCB)


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