Anova Gage Rr

MiniTab includes the insignificant interaction Term Operator x Part in the final calculation of%GAGE R&R. Attached I have an EXCEL ANOVA GRR Calculation for the same data's which I put into Minitab. If you stay with alpha 0.25 to remove the insignificant interaction term Operator x Part the Results differ from Minitab.

Jun 16, 2015 - Reported by: Person who is creating the ANOVA report. In a study with good results, the Gage R&R yellow value should be very low and the.

(even though MiniTAb Session Window stated to remove the Interaction Term also at alpha 0.25) If you manipulate alpha to 1 in my Excel Sheet to INCLUDE the insignificant OPxPart Interaction --> everything is fine. But this is wrong! Ok it differs not much but unfortunately these Values are used to callibrate the Outcome from other Statistical Software. And therefore some People who trust MiniTab would say my EXCEL Calculation is somehow wrong. MiniTab includes the insignificant interaction Term Operator x Part in the final calculation of%GAGE R&R. Attached I have an EXCEL ANOVA GRR Calculation for the same data's which I put into Minitab.

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If you stay with alpha 0.25 to remove the insignificant interaction term Operator x Part the Results differ from Minitab. (even though MiniTAb Session Window stated to remove the Interaction Term also at alpha 0.25) If you manipulate alpha to 1 in my Excel Sheet to INCLUDE the insignificant OPxPart Interaction --> everything is fine. But this is wrong! Ok it differs not much but unfortunately these Values are used to callibrate the Outcome from other Statistical Software.

And therefore some People who trust MiniTab would say my EXCEL Calculation is somehow wrong.

Use the ANOVA table to identify which sources of variability are significant. The ANOVA table includes the following terms in the Source column: • Part: The variation that is from the parts. • Operator: The variation that is from the operators. • Operator*Part: The variation that is from the operator and part interaction. An interaction exists when an operator measures different parts differently.

• Error or repeatability: The variation that is not explained by part, operator, or the operator and part interaction. Use the variance components (VarComp) and%Contribution to assess the variation for each source of measurement error. The sources are as follows: • Total Gage R&R: The sum of the repeatability and the reproducibility variance components.

• Repeatability: The variability in measurements when the same operator measures the same part multiple times. • Reproducibility: The variability in measurements when different operators measure the same part. • Part-to-Part: The variability in measurements due to different parts. Ideally, very little of the variability should be due to repeatability and reproducibility. Differences between parts (Part-to-Part) should account for most of the variability. Variance Components%Contribution Source VarComp (of VarComp) Total Gage R&R 0.0020816 6.82 Repeatability 0.0011541 3.78 Reproducibility 0.0009275 3.04 Part-To-Part 0.0284585 93.18 Total Variation 0.0305401 100.00 Key Results: VarComp,%Contribution The%Contribution for part-to-part variation is 93.68%. Minitab divides the part-to-part variance component value, 0.0308455, by the total variation, 0.0329271, and multiplies by 100%.