Leveraged Gauge R&R Studies

Abstract

To assess measurement system variation, we propose an alternative to the standard gauge reproducibility and repeatability (GR&R) study. The new plan, called a leveraged GR&R Study, is conducted in two stages. In the baseline stage, we select a sample of parts that are measured once only each using a fixed number of operators. Then we deliberately select extreme parts for the second stage where each operator measures each selected part a number of times. We demonstrate the advantages of the leveraged over the standard plan by comparing the standard deviations of the estimators of the parameters of interest. For a fixed number of operators and total number of measurements, we recommend leveraged plans with a baseline size that is roughly half the total number of measurements. We also recommend that the number of parts selected for the second stage be set to an integer multiple of the number of operators and that each of these parts be measured two or three times by each operator. This article has supplementary material online.

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