spc-advanced80-92(完整版)
【正文】 a t i o n N u m b e r UCL LCL Seasonal Trends: These could be caused by systematic changes like: temperature, operator fatigue, voltage or pressure fluctuations, etc. Mixtures: A clear indication is when most of the points are close to the control limits, and almost no points near the center line. These are usually due to underestimating the process variability or “overcontrol” , where operators intervene with the process frequently trying to respond to inherent variability instead of assignable causes. This also occurs when controlling two processes on the same chart. 控制圖的趨勢判斷規(guī)則 SPCadvanced training course 2 0 1 0 0 O b s e r v a t i o n N u m b e r UCL LCL 1 5 1 0 5 0 O b s e r v a t i o n N u m b e r UCL
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