Example of the Data Units Option

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Quality and Process Methods • CUSUM Control Charts • Additional Example of CUSUM Control Charts • Example of the Data Units Option

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Example of the Data Units Option

This example uses the Data Units option and reproduces the analysis in Example of CUSUM Control Chart. You want to detect small shifts in the temperature of an engine. The data table contains temperature measurements from the engine thermostat.

1.

Select Help > Sample Data Library and open Quality Control/Engine Temperature Sensor.jmp.

2.

Select Analyze > Quality and Process > CUSUM Control Chart.

3.

Select Y and click Y.

4.

Select the box next to Data Units.

5.

6.

In the Target box, type 100.

7.

In the Sigma box, type 10.

Note that the options below Head Start are H and K, instead of h and k. These parameters are now specified in units of the data column, rather than in standard deviation units.

8.

Check the box next to Lower Side.

Figure 4.5 CUSUM Control Chart Report

Like in the example using sigma units, the vertical line on the CUSUM Chart indicates that a shift in the temperature measurements started around sample 26.

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Help created on 7/12/2018