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Robustness of Variance Estimates for Batch and Continuous Processes

Summary: The complexity of a hierarchical process structure containing nested and crossed factors is an important concern for estimating variability. This article considers the effects of such a structure on traditional estimates and recommends sampling strategies to provide a robust estimate of process variability.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: Process control,Control charts,Moving range control charts
  • Author: Runger, George C.
  • Journal: Quality Engineering