The median is a measure of control tendency derived from taking the middlemost or most central point in a set of sorted points. Half of the points will lie above the median, and the other half will lie below the median. If the number of points is odd the middle point is the median. If there is an even number of points the median is the average of the middle points. The lowest value found in the data selected. Moving Range Upper Control Limit represented by MRUCL The Moving Range Average is based on succesive differences between individual values. The number of non-null values found in the data selected. Observed percent above upper control limit. Observed percent above upper specification limit. Obs ppm above USL represented by Oppm>USL Obs ppm above UCL represented by Oppm>UCL Observed percent above upper warning limit. ![]() Obs ppm above UWL represented by Oppm>UWL Obs ppm below LCL represented by Oppm 100 then m = 100įixed specification limits must be outside fixed control limits and the target.
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