Labels:reckoner | sky OCR: EWMA chart Each point on an exponentially weighted moving average (EWMA) chart, also referred fo as geometric moving average (GMA) chart, the we ighted average all the previous subgroup means including the mean of the present subgroup sample The weights decrease exponentially going backward in time The weigt assigned to the present subgroup sample mean parameter of EWMA chart. Small values ofr are used to guard against small shifts the EWMA chart reduces to Mean control (Shewhart) chart previously discussed. Like all control charts, moving average charts update dynamically when you ad rows to the current data table weigh movino
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