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Cauchy distribution. Where is Process capability button?

Leonard

Why where is no Process Capability button? Or you can't do it with Cauchy's distribution data.

Accepted answers

txnelson

According to the JMP Documentation, the Cauchy distribution has an undefined Mean and Standard Deviation. Based upon that, I assume JMP does not have Cp and Cpk for that distribution and thus no need for the button.

All comments

Leonard

Sorry... Why is there no process capability button?

txnelson

Leonard

Yes, but then how do I calculate PPK? Should I take the nearest distribution, if it is? Or should I calculate PPK using Standard Deviation? I need to evaluate the process with nonnormal data distribution.

txnelson

Have you tried fitting all the Distributions, and then determine which have a significant Goodness Of Fit? You could then use that distribution for your Cp and Cpk

Mark_Bailey

Actually, the mean of the Cauchy distribution is defined but not the higher moments. So, no variance, no standard deviation. No standard deviation, no Ppk.

Kevin_Anderson

And, just as an aside, if you're responsible for improving a process that outputs data that are really Cauchy distributed, you might want to update your resume...