Abstract
A set of well-defined equations is required for quantifying statistical product quality and reliability. Specific equations and their inherent measurement errors as a function of reporting period, lead time and fluctuating shipment levels are discussed. This paper covers three quality and reliability measurements, two being new-shipment measurements: (1) overall embedded annualized field return rate, (2) short-term or four-quarter rolling annualized field return rate, and one being repair quality: Rate of re-return.
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