| 术语 | 描述 |
|---|---|
| 控制限 control limits | Statistically determined limit lines on a control chart, called the upper control limit (UCL) and the lower control limit (LCL). |
| 中心线 centre line | A reference value of the plotted characteristic on a control chart, usually the average of the statistical measure being considered. |
| 子组 subgroup | A set of sample observations taken from a process at approximately regular intervals. |
| 过程能力 process capability | The ability of a process to produce output within specification limits. |
| 警告限 warning limits | Lines marked at 2 sigma limits on a control chart to warn of an impending out-of-control situation. |
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