This generalized chart, is called herein the generally weighted moving average (GWMA) control chart.The GWMA provides a unified treatment of the special cases: the Shewhart X chart and the EWMA chart.

• 最后，经由所掌握之管制图参数特性，组合一系列的X-GWMA管制图进行模拟评估，并得到平均连串长度具良好特性之研究结果外，因可分别将两种统计量及管制界限绘制于同一张管制图内，而产生一张合并的管制图。