First, you have what looks like a typo in your data set (row 71). Second, Operator and Part are crossed and the repeats (run) are nested. Minitab is showing 27 DFs for part and yet you have only 10 parts in the study. This is incorrect. The numbering scheme in your data set also appears incorrect. For the Run column, I believe this is precision repeatability, the numbering should be 1-90 unless you have some hypotheses about a possible systematic pattern to the order of measurement (every measurement is unique). I believe you can have Minitab do a crossed study. I have attached a .doc with that analysis.

That being said, to be honest, I've never used the** JMP Gage R&R **(Option under Variability Charts) platform (I'm old school and do the analysis using variability plots, traditional control charts and ANOVA). The **Variance Components** (Variance Components option under Variability Charts) appear correct. The control chart appears correct.

However, when I tried the** Gage R&R **option**,** I got strange and apparently incorrect, results (Perhaps I am doing the analysis wrong??? ). Examining the** Variance Components for Gauge R&R**, there is no way the Reproducibility is 99.33%. This appears mis-labeled (I would report this to JMP technical support).

I have attached a journal (and the JMP data table) where I first did the analysis as a nested study (which is incorrect). Then I repeated the study as a crossed-nested study. The variance components look correct. The Gage R&R options look to be wrong?

"All models are wrong, some are useful" G.E.P. Box