Change Patterns of Time Series-Based Control Charts
作者:
HuS. Jack,
RoanChinmo,
期刊:
Journal of Quality Technology
(Taylor Available online 1996)
卷期:
Volume 28,
issue 3
页码: 302-312
ISSN:0022-4065
年代: 1996
DOI:10.1080/00224065.1996.11979680
出版商: Taylor&Francis
关键词: Autocorrelated Process;Statistical Process Control;Time Series Analysis
数据来源: Taylor
摘要:
Autocorrelation in process measurements results in false alarms when traditional control charts, such asX̄andRcharts, are applied in process monitoring. A popular approach proposed in the literature is to use time series models to remove the autocorrelation, and then to apply control charts to the residuals, or prediction errors. However, when a time series model is used to remove the autocorrelation, the change patterns may be severely altered, making the interpretation of a process change and root cause analysis erroneous. This paper develops charts for the comparison of change patterns for two types of additive process faults before and after applying time series modeling. The process changes are sustained mean shifts and sporadic spikes. These charts provide improved understanding of the characteristics of autocorrelated processes.
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