Statistical Quality Control

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3 domain-specific abstractions whose origin domain is Statistical Quality Control.

• EWMA chart — Monitor a time-ordered process by plotting a recursively updated exponentially weighted statistic against model-based control limits, retaining geometrically decreasing memory to improve sensitivity to sustained small shifts.
• Process capability index — A family of ratios comparing a statistically stable process’s natural variation and centering with engineering specification limits.
• U-chart — A statistical process-control chart for nonconformities per inspection unit when the number or size of units inspected can vary between samples.