Abstract
Traditional Weibull distribution is unable to model the complete lifetime of systems with a bathtub failure rate function. As a consequence, a new model is quoted in this paper, in which the conditions of models with bathtub failure rate function failure mechanism and the method to determine acceleration factor are discussed in detail. Furthermore, I make an example by using the best overall unbiased estimation to illustrate the method. In addition, parameter range of the acceleration factor is given at last.
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