Please see my data as below
|*Specification||295 - 325|
I apparently are not understanding your question. Here are my results of Cp and Cpk for your data
Thank you for the reccommendation but normally I use Cpk from "Quantile sigma" , it is shown like below.
Can I ask more question, between Cpk from "Long term sigma" and "Quantile sigma" , in which case should we use it?
I'm not sure why the SHASH distribution gives zero as the result but I've not had much success using SHASH for process capability. In your case your data only has 5 distinct levels, and the distribution requires 5 parameter estimates so you really are running out of degrees of freedom and the SHASH is probably a total over-fit of your data.
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