How can I test for special causes, like a point outside the control limits?

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Réponse

You can use the 'primaryTests' parameter. It's a list where you can enable specific tests. For instance, setting 'test1=True' requests a test for one point beyond Zone A (outside the control limits). Other tests (test2 through test8) detect different non-random patterns.
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cChart

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Other questions about cChart
How does the `sigmas` parameter affect the control limits? What pattern is identified by `test2`? How does the action handle subgroups with varying sample sizes? What does the `allN` parameter do in the cChart action? Can I run tests for special causes if my control limits are not 3-sigma?
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