Process Capability: Subgrouping vs. no subgrouping?
Hi, I am currently working on a Cpk Ppk analysis (JMP Pro 17.1) and I am very unclear on what subgrouping is and whether it is needed in my analysis. I have the same lab results dataset however did the Process Screening/Capability slightly differently:
1. Process Screening --> Process Variables = Grade A (leaving Grouping, Subgroup, Time and By column empty).
Result: 2. Process Screening --> Process...
gav2013