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Who was the first person to study the effect of the number of subgroups used for x bar and R chart control limit calculation on the false alarm rate?

Who was the first person to study the effect of the number of subgroups used for x bar and R chart control limit calculation on the false alarm rate? Correct Answer Hillier

The false alarm rate of the Shewhart control charts also depends over the number of subgroups used to construct the trial control limits. This was first studied by Hillier (1969).

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