Gage R&R on Transformed Data?

Six Sigma – iSixSigma Forums General Forums Methodology Gage R&R on Transformed Data?

This topic contains 1 reply, has 2 voices, and was last updated by  Chris Seider 11 months, 2 weeks ago.

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    Jacob E

    In my Gauge R&R analysis (4 parts, 4 operators, 3 repeats), the plot of residuals versus fitted values exhibits a funnel shaped pattern; the variance increases as the measured response increases. A square root transformation on the response variable does a nice job of correcting this problem.

    But…is it ok to perform GRR on transformed data? My concern is that the interpretation of the results are now based on the square root of the measurements. Can I still make a conclusion on the repeatability and reproducibility of the measurements based on their square root? The actual variance component values are smaller, but the %contribution remains relatively unchanged (compared to non-transformed data).

    Any insights?

    Thank you!


    Chris Seider

    Did your gage pass? Transformation is a neat tool but if the outputs/inputs aren’t precisely measured by the gage, transformation won’t help.

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