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Bayes credibility estimation of an exponential parameter for random censoring and incomplete information

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2 Author(s)
Elperin, T.I. ; Ben-Gurion Univ. of Negev, Beer Sheva, Israel ; Gertsbakh, I.B.

A Bayes interval estimation for an exponential parameter Θ in a model of random censoring with incomplete information is investigated. The instant of item failure is observed if it occurs before a randomly chosen inspection time and the failure was signaled; otherwise, the experiment is terminated at the instant of inspection. An explicit expression for the posterior PDF (probability distribution function) of the parameter is derived, and a normal approximation to it based on Taylor expansion near the maximum likelihood estimate is suggested. The results of an extension simulation showed that the reparametrization Θ1=log Θ appreciably increases the accuracy of the normal approximation. Highly accurate highest posterior density intervals for Θ1 are derived in a closed form for a normal prior for Θ1 or, equivalently, for the lognormal prior on Θ

Published in:

Reliability, IEEE Transactions on  (Volume:39 ,  Issue: 2 )

Date of Publication:

Jun 1990

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