Measurement system analysis has been a major part of process characterizations and improvements, with key guidance from the original Automotive Industry Action Group reference manual. There has been some critical review, particularly of summary metrics such as gage repeatability and reproducibility (GR&R) and percent tolerance (also known as precision-to-tolerance ratio) and what are considered acceptable values.1,2,3 In industries such as medical devices, measurement system analyses can influence decisions that can critically affect the lives of patients. Consequently, the impact of measurement system analyses on decision making, as related to the probability of misclassification, is of vital importance.
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