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。
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