Division by the approximate upper control limit allows the points to be plotted against an effective upper control limit of 1. A Change Point Detection plot readily shows the change point for a shift occurring at the maximized value of the control chart statistic. The Change Point Detection implementation in JMP is based on Sullivan and Woodall (2000) and is described in Statistical Details for Change Point Detection.
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In the Example of Change Point Detection, data are divided into two groups. The first 24 observations are classified as the first group. The remaining observations are classified as the second group.
