手法を比較

	頑健管理図	プロセス能力解析 (Cp, Cpk)
分野	実験計画法	統計学
系統	Process / pipeline	Process / pipeline
提唱年	1989–1997 (foundational period)	1986
提唱者	David M. Rocke; L. G. Tatum (key contributors)	Victor Kane
種類	Statistical process monitoring technique	Quantitative process evaluation index
原典	Tatum, L. G. (1997). Robust estimation of the process standard deviation for control charts. Technometrics, 39(2), 127–141.	Kane, V. E. (1986). Process capability indices. Journal of Quality Technology, 18(1), 41–52.
別名	robust Shewhart chart, outlier-resistant control chart, robust SPC chart, distribution-free control chart	Process Capability Indices, Capability Study, Süreç Yeterlilik Analizi, Process Performance Analysis
関連	6	2
概要	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.	Process Capability Analysis quantifies how well a manufacturing or business process produces output within specified tolerance limits. Introduced formally by Victor Kane in 1986, it summarises process spread and centering into dimensionless indices — most notably Cp and Cpk — allowing engineers and quality managers to judge whether a stable process is inherently capable of meeting customer or design specifications consistently.