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Nov 12, 2019 10:22 AM
(776 views)

Hello,

I have a data table like below, with variable control limits. I would like to generate a control plot with spec lines. I can do it in overlay plot, but is there anyway I can do it in Fit Y and X plot, or control chart? Because I would like to modify the lengend for different groups, add fitting line etc, which I could not do on overlay plot.

Thanks!

Data | Time | LCL | UCL | Target | Group |

6369.36 | 11/8/2019 13:07 | 4000 | 7081 | 5540 | a |

6220.436 | 11/8/2019 15:15 | 4000 | 7081 | 5540 | b |

6553.124 | 11/9/2019 16:15 | 4000 | 7081 | 5540 | a |

6659.495 | 11/9/2019 17:54 | 4000 | 7081 | 5540 | a |

6153.043 | 11/10/2019 6:49 | 5000 | 8081 | 6540 | b |

6587.26 | 11/10/2019 18:40 | 5000 | 8081 | 6540 | a |

6922.839 | 11/10/2019 22:53 | 5000 | 8081 | 6540 | b |

6608.837 | 11/11/2019 0:44 | 5000 | 8081 | 6540 | a |

7134.386 | 11/11/2019 23:22 | 5000 | 8081 | 6540 | b |

6936.434 | 11/12/2019 0:51 | 5000 | 8081 | 6540 | a |

7339.771 | 11/12/2019 7:34 | 5000 | 8081 | 6540 | b |

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You can do this Control Chart Builder with a phase variable. Here is a blog post that details the steps.

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7 REPLIES 7

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Re: Variable Control limit plot

You could do it in Graph Builder if you stack your Data, LCL, UCL, and Target columns by dropping the resulting Label column into the Overlay drop zone. Are you sure you want your specs on your control chart? That often drives bad behavior like not reacting to out of control points that are in spec. Sorry, I know that is unsolicited advice.

-- Cameron Willden

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You can do this Control Chart Builder with a phase variable. Here is a blog post that details the steps.

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Re: Variable Control limit plot

The only downside to that is you can't fix your control limits. They will always be re-estimated from the data within each phase.

-- Cameron Willden

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I'm not sure which method you are refering to when you say "They only downside to that is you can't fix your control limits." My blog post details how to fix your control limits for each phase. You can specify a different set of historical control limits for each phase of your data in Control Chart Builder.

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Re: Variable Control limit plot

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Re: Variable Control limit plot

response got duplicated

-- Cameron Willden

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Re: Variable Control limit plot

Sorry, I hadn’t read the blog post and didn’t realize you addressed that capability in the blog. I didn’t know that was possible to do

-- Cameron Willden

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Re: Variable Control limit plot

Create a spec limit property for the column(s) that have specs and make sure you check the box that says "Show as Graph Reference Lines". Then any visual you make with those columns will show lines for the spec limits.

Similarly, you can also define control limits as a column property and they would show up in a control chart.

Similarly, you can also define control limits as a column property and they would show up in a control chart.