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Detecting a Shift in Process Average: Tables of the Power Function for X Charts

Summary: Tables of the power function of the X-bar chart are given for each of four sets of detection rules, for each of eleven shifts in the process average, for up to 10 subgroups following the shift, and for subgroup sizes ranging from n = 2 to n = 100. Also given is a table for Type 1 error probabilities for each of the four sets of detection rules, for up to 10 successive subgroups.

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  • Topics:
  • Keywords: Control charts,Statistical methods,X-bar control charts
  • Author: Wheeler, Donald J.
  • Journal: Journal of Quality Technology