The previous example illustrates how you can create EWMA charts using raw data (process measurements). However, in many applications the data are provided as subgroup summary statistics. This example ...

EWMA is a tool for forecasting data in time series analysis. It is often utilized in control charts, along with control limits. You’ll want to use other tools for observing larger shifts in process ...

which expresses the current EWMA as the previous EWMA plus the weighted error in the prediction of the current mean based on the previous EWMA. The EWMA for the i th ...

Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 47, No. 2 (1998), pp. 203-216 (14 pages) In the manufacture of metal fasteners in a progressive die operation, and other ...

Residual-based control charts are popular methods for statistical process control of autocorrelated processes. To implement these methods, a time series model of the process is required. The model ...