NF ISO 7870-6, X06-036-6 (07/2024)

ISO 7870-6:2015 addresses EWMA control charts as a statistical process control technique for detecting small amplitude drifts/misalignments in the process average. It makes it possible to detect small and medium amplitude misadjustments in the process average more quickly. In this map, the process average is evaluated in terms of an exponentially weighted moving average of all prior sample averages. The EWMA map weights samples in descending order according to a geometric sequence, so that newer samples are weighted more heavily while older samples have a very small contribution depending on the smoothing parameter (?).
(Automatic translation from French)