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Prediction Bounds in Accelerated Life Testing: Weibull Models with Inverse Power Relationships

Summary: [This abstract is based on the authors' abstract.] The problem of obtaining lower prediction bounds for a future observation from a Weibull population at design stress level is investigated using Type II censored accelerated life test data from higher than design stress levels. By assuming the scale parameter of the life distribution has an inverse power relationship with the stress level, a predictive density for a future observation at the design stress level is easily obtained. Results show that a modified version of the proposed predictive density provides reasonable lower prediction bounds.

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  • Topics: Data Quality, Product Development and Recall
  • Keywords: Life tests,Censored data,Weibull distribution,Prediction limits,Product development,Likelihood methods
  • Author: Jayawardhana, A.A.; Samaranayake, V.A.
  • Journal: Journal of Quality Technology