Example of Change Point Detection | JMP 13.2

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Quality and Process Methods • Multivariate Control Charts • Additional Examples of Multivariate Control Charts • Example of Change Point Detection

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Example of Change Point Detection

Use change point detection to find the point at which a shift occurs in your data.

1.

Select Help > Sample Data Library and open Quality Control/Gravel.jmp.

2.

Select Analyze > Quality and Process > Control Chart > Multivariate Control Chart.

3.

Select Large and Medium and click Y, Columns.

4.

5.

From the red triangle menu, select Change Point Detection.

Change Point Detection for Gravel.jmp

Tip: You might need to drag the axes to see the density ellipses for the two groups, depending on your data.

In the Change Point Detection plot, values above 1.0 indicate a possible shift in the data. At least one shift is apparent; the change point occurs at observation 24 and the shift occurs immediately after observation 24. The 95% prediction regions for the two groups have approximately the same size, shape, and orientation, visually indicating that the sample covariance matrices are similar.

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Help created on 9/19/2017