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Laney P and U charts

shampton82

Can you please add the ability to test for over dispersion/under dispersion and then the option to make Laney P and U charts?

Status: New

Comments

mia_stephens

Hi Steve,

Lany P' and U' charts are being added in JMP 17. We've considered adding tests for over and under dispersion, but there does not seem to be consensus in peer-reviewed publications on an appropriate method. Do you know of any cited references?

Thank you,

Mia

shampton82

Hey Mia,

Thats great to hear, thanks for the update!

This is what I had used in my pre-JMP days:

https://support.minitab.com/en-us/minitab/18/help-and-how-to/quality-and-process-improvement/control-charts/how-to/attributes-charts/p-chart-diagnostic/methods-and-formulas/methods-and-formulas/

mia_stephens

Thanks Steve, we've found that as well. However, no references are cited that we can find. Still looking for a peer-reviewed publications if you come across any.