![]() ![]() When, the inner sum is, as you compute. And when changes, the value of the inner sum changes by more than just : you add four times (once for each of, ,, and ), so you end up adding, not just. There are also options to easily re-run stability analysis after changing data or control limit calculations. What you are doing wrong is that you need to do the inner sum three times, once for each value of. Recalculate UCL/LCL - recalculate control limits after adding new data.Delete a Point - remove a point from the chart and from control limit calculations.Ghost a Point - leave data point on a chart but remove it from control limit calculations. ![]() stair step control limits) on a point you choose
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