Evaluation of a three-state adaptive sample size X control chart
研究开发了一种三状态自适应样本量控制图，并与标准Shewhart控制图和两状态自适应样本量控制图比较，发现自适应方法能更好检测过程均值的小偏移，但三状态相比两状态改进有限。
A three-state adaptive sample size control chart is developed and its performance is compared with the standard Shewhart control chart and a two-state adaptive sample size control chart. In general, significant improvements in shift detection capability results from using an adaptive sample size control chart, and the threestate adaptive control chart is superior to the two-state adaptive control for small shifts in the process mean. The improvements found in the two-state and threestate adaptive control chart schemes are gained without increasing the average incontrol sample size over the standard non-adaptive Shewhart control chart. The three-state procedure is only slightly better than the two-state scheme, and so the two-state scheme is likely adequate in most applications. The three process monitoring techniques are compared using both steady-state and start-up cases.