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Sandra233
Sandra233
Level III

How do I get Formula of calculate quantile spec limits in process capability

Mar 11, 2025 01:59 AM (393 views)

I do distributions analysis in jmp pro.18 with fit smooth curve function, then get USL/LSL value by using 6-sigma to calculate quantile spec limits under process capability function. I'd like to know what formula is used to calculate USL/LSL. I'm trying to run the same formula in the excel version. 

wilsonliao233_0-1741672076915.png

 

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WebDesignesCrow
Super User WebDesignesCrow
Super User

Re: How do I get Formula of calculate quantile spec limits in process capability

Mar 17, 2025 03:16 AM (321 views)  |  Posted in reply to message from Sandra233 03-11-2025

Hi @Sandra233 

 

Check below link if it can answer your question.

Statistical Details for Capability Indices for Nonnormal Distributions

Find new spec limits by adjusting the CpK value - JMP User Community

 

The 6Sigma is equivalent to 1.413

 

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