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| Robust Control Chart× | Statistisk processtyrning× | |
|---|---|---|
| Ämnesområde | Försöksplanering | Försöksplanering |
| Familj | Process / pipeline | Process / pipeline |
| Ursprungsår≠ | 1989–1997 (foundational period) | 1924–1931 |
| Upphovsperson≠ | David M. Rocke; L. G. Tatum (key contributors) | Walter A. Shewhart |
| Typ≠ | Statistical process monitoring technique | Process monitoring and quality control method |
| Ursprungskälla≠ | Tatum, L. G. (1997). Robust estimation of the process standard deviation for control charts. Technometrics, 39(2), 127–141. DOI ↗ | Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand. ISBN: 978-0873890762 |
| Alias | robust Shewhart chart, outlier-resistant control chart, robust SPC chart, distribution-free control chart | SPC, statistical quality control, process control charting, Shewhart control |
| Närliggande | 6 | 6 |
| Sammanfattning≠ | 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. | Statistical Process Control (SPC) is a data-driven quality method that uses statistical techniques — primarily control charts — to monitor a manufacturing or service process over time. By distinguishing natural process variation (common cause) from unusual, actionable variation (special cause), SPC enables practitioners to maintain processes in a stable, predictable state and to detect problems early, before defective output reaches customers. |
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