Optimal simple step-stress plan for Khamis-Higgins model

Abdulla A. Alhadeed, Shie Shien Yang

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    38 Citations (Scopus)


    Optimal times of changing stress-level for the simple step-stress plans under the Khamis-Higgins model (an alternative to the Weibull step-stress model) are determined for a wide range of values of the model parameters. The applicability of the "optimal time of changing stress" formula obtained by Khamis-Higgins for a known shape parameter to the case of unknown shape parameter is examined. Their formula provides a reasonable approximation to the actual optimal times of changing stress levels within a certain range of values of the stress levels and model parameters but a poor approximation outside of that range.

    Original languageEnglish
    Pages (from-to)212-215
    Number of pages4
    JournalIEEE Transactions on Reliability
    Issue number2
    Publication statusPublished - Jun 2002


    • Accelerated test
    • Maximum likelihood estimation
    • Step-stress
    • Weibull life distribution

    ASJC Scopus subject areas

    • Safety, Risk, Reliability and Quality
    • Electrical and Electronic Engineering

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