ISO 7870-9:2020 PDF

Overview

ISO 7870-9:2020 - "Control charts - Part 9: Control charts for stationary processes" provides guidance on constructing and applying statistical process control (SPC) charts when process data exhibit autocorrelation but are in statistical equilibrium (stationary). The standard outlines practical charting approaches for monitoring process means and variability when the fundamental i.i.d. assumption of traditional SPC charts does not hold.