Recentlyseveral
control charts have been introduced in thestatistical process control literature which are basedon the idea of Bayesian Predictive Density
(BPD). Among these charts is the
variation control chart which we refer to it as VBPD chart.
In this paper we add the idea of Moving Average to VBPD
chart and introduce a new variation control chartwhich has all advantages of the original VBPD
chart and in addition has a new advantage which is its sensitivityto small changes in process variance. We
refer to this new chart as MAVBPD chart.
In both VBPD and MAVBP charts , the parameters are assumed unknown
but the control statistic has a known F distribution which means that, the
control limits can be obtained without
simulation.