Year: 2003
Type: article
Abstract: The Shewhart Xbar chart is effective in detecting large shifts in a process but unable to find moderate shifts. We show that this blind spot allows shifts smaller than one standard deviation to continue undetected for long periods, thereby incurring much larger total costs than do rapidly detected large shifts. Augmenting the Shewhart chart with a cumulative sum chart largely plugs this gap, leading to much more effective process monitoring.
Source: Quality Engineering
Authors: Douglas M. Hawkins*, K. D. Zamba
Institution: University of Minnesota
Language: English
Subfield: Statistics, Probability and Uncertainty
Field: Decision Sciences
Domain: Social Sciences
Open Access status: bronze
Funder: National Science Foundation
OpenAlex ID: W1557883196