Stat > Control Charts > Time-Weighted Charts > Moving Average > MA Options > Tests
Specify the number of standard deviations from the center line that causes a point to fail the test.
When a point fails, it suggests a special cause for the variation that you should investigate. Minitab marks it in red on the plot.
You can choose to change the color of a control chart when the last row of data causes a new test failure for any point. See Tools > Options > Control Charts and Quality Tools > Other.
You can set the default sensitivity of this test using Tools > Options > Control Charts and Quality Tools > Tests.
The test results are displayed in the Session window. If the data change and the control chart is live-linked, the test results are not updated in the Session window. See Updating Graphs for more information.
Minitab will perform tests when subgroup sizes are unequal.
See [1] and [32] for guidance on using these tests.
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K |
1 point more than K standard deviations from center line K determines where the control limits are drawn on the chart. |
3 |