Robust Control Chart
A robust control chart replaces the classical mean and standard deviation estimators in a Shewhart-style chart with resistant alternatives — such as the median and median absolute deviation (MAD) — so that a small fraction of outliers or non-normal process data cannot distort the control limits. The approach preserves the real-time monitoring logic of standard control charts while protecting against inflated or deflated limits caused by contaminated Phase I reference data.
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- Tatum, L. G. (1997). Robust estimation of the process standard deviation for control charts. Technometrics, 39(2), 127–141. · DOI 10.1080/00401706.1997.10485078
- Rocke, D. M. (1989). Robust control charts. Technometrics, 31(2), 173–184. · DOI 10.1080/00401706.1989.10488511
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