An EWMA Control Chart for Monitoring the Mean of Skewed Populations Using Weighted Variance.ud

摘要

This paper discusses the use of weighted varianceud(wv) in setting up the limits of the exponentially weightedudmoving average (EWMA) chart for the monitoring of theudmean of a process from a skewed population. This chart,udcalled the WV-EWMA chart hereafter, reduces to theudstandard EWMA chart when the underlying distribution isudsymmetric.ud