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A Source of Bias in Attributes Testing, and a Remedy

Summary: Misclassification errors should be expected when quality control attributes tests are run, and should be considered. For the usual range of fraction defective in inspected samples or lots, these errors can result in surprisingly high false defective rates (nondefectives classified as defectives), although false nondefective rates will be small. Such biases can occur even when the costs for rejection and rework. The mechanism of this phenomenon is explained, and a method of calibrating the inspection or test procedure to reduce the magnitude of the misclassification errors is suggested.

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  • Topics: Sampling
  • Keywords: Acceptance sampling,Classification
  • Author: Wooding, W.M.
  • Journal: Journal of Quality Technology