topic Re: EMP GRR : AIAG reproducability in Discussions

EMP GRR : AIAG reproducability

carloaz — Tue, 03 Mar 2026 13:34:23 GMT

using ANOVA from Fit Model and then GRR EMP + AIAG GRR , we are matching the Within Repeatability Variance and Part to Part Variance but :

the Reproducability Variance is expected to be zero ( actually it was negative )

Can we get help to understand from where the Reproducability Var component is worked out ?

Please use the truncated data in the files

Re: EMP GRR : AIAG reproducability

jthi — Tue, 03 Mar 2026 14:08:02 GMT

Quality and Process Methods > Variability Gauge Charts > Variability Gauge Analysis Report Options > Variance Components

Re: EMP GRR : AIAG reproducability

statman — Tue, 03 Mar 2026 14:42:39 GMT

What truncated data in what files?

Re: EMP GRR : AIAG reproducability

paolo_chiappa — Tue, 03 Mar 2026 14:53:25 GMT

Here's a document resuming the missing files (I am just uploading it on behalf of the user). Thank you all in advance for your support.

-Paolo

Re: EMP GRR : AIAG reproducability

statman — Tue, 03 Mar 2026 15:07:59 GMT

Please upload the JMP file. The pdf file isn't helpful. How many operators were in the study?

Re: EMP GRR : AIAG reproducability

paolo_chiappa — Tue, 03 Mar 2026 15:33:17 GMT

I am trying again to upload the jmp dataset on behalf of the user (please run the script "EMP Measurement Systems Analysis of truncated readings by Operator" to see the report the user is talking about)

Re: EMP GRR : AIAG reproducability

jthi — Wed, 04 Mar 2026 10:24:46 GMT

Based on this Quality and Process Methods > Measurement Systems Analysis > Launch the Measurement Systems Analysis Platform I would assume it is using REML for variance part of the analysis. How did you model it in Fit Model?

Not sure if I did model this correctly

Re: EMP GRR : AIAG reproducability

carloaz — Wed, 04 Mar 2026 10:35:41 GMT

ok issue solved :

Although Var Operators is negative , it is added to Var opx parts to be then var comp , the numbers do match and many thanks to all contributors

Re: EMP GRR : AIAG reproducability

carloaz — Wed, 04 Mar 2026 10:36:19 GMT

issue solved : check above , thank you

Re: EMP GRR : AIAG reproducability

carloaz — Wed, 04 Mar 2026 10:36:50 GMT

thanks , issue solved see above

Re: EMP GRR : AIAG reproducability

PatrickGiuliano — Thu, 05 Mar 2026 03:29:35 GMT

Thanks @carloaz. In Fit Model, if we uncheck the Unbounded Variance Components Option, then this will allow that negative variance estimate for Operator to be bounded at zero, and the results will match identically with what you for the Variance Components in the EMP Gauge R&R Report (see attached).

Re: EMP GRR : AIAG reproducability

PatrickGiuliano — Thu, 05 Mar 2026 03:32:13 GMT

Here are the results which show complete agreement between Fit Model (Fit Standard Least Squares with REML) and the EMP GRR Platform, where "Residual" is equal to "Within" (see attached).