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Evaluating a Well-Known Criterion for Measurement Precision

Summary: When testing products before shipment to the consumer, quality characteristics are measured to decide whether or not their values are between the specification limits. Unfortunately, this testing procedure can lead to incorrect decisions because of measurement error. That is, good products can erronously be qualified as bad, and bad products as good, and this has consequences for producer's and consumer's risk. To determine the quality of measurement methods by simple means, a criterion exists that compares the standard deviation of the measurement precision with the width of the specification interval. If this criterion is satisfied, the producer's and consumer's risk should be limited. In this article, the criterion is related to the probability of making correct decisions at product testing, and process conditions are determined under which the criterion is useful.

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  • Topics:
  • Keywords: Precision,Risk analysis
  • Author: Engel, Jan; De Vries, Bert
  • Journal: Journal of Quality Technology