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Gage Triage Analysis for MSA Studies

Summary: Measurement systems analysis (MSA) studies are a central element of the measure phase of define, measure, analyze, improve and control (DMAIC). The core method of MSA variable gage studies is the gage repeatability and reproducibility (GRR) study familiar to all Six Sigma practitioners. The two approaches for variable measurement GRR studies are given by the Automotive Industry Action Group (AIAG): the analysis of variance (ANOVA) and the average and range (AR) methods. Both methods provide estimates of R&R variation. Measurement accuracy is typically assessed in a separate study. Previous work provided a method to obtain estimates of all MSA variation parameters in one study. This ANOVA approach uses a gage accuracy, repeatability and reproducibility (GARR) analysis or a related gage accuracy and repeatability (GAR) analysis. These methods further partition precision by adding random bias and evaluating constant bias for a complete one-step MSA. The AR approach for the GAR model is developed in this article and provides the basis for the gage triage analysis (GTA) approach.

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  • Topics: Six Sigma
  • Keywords: Measurement system, Six Sigma, DMAIC, Gage Repeatability and reproducibility studies (GR&R), Analysis of variance (ANOVA), Bias, Measurement, Automobile industry, Automotive Industry Action Group (AIAG), Accuracy and precision
  • Author: Kane, Victor E.
  • Journal: Six Sigma Forum Magazine