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Unidentified competing causes. Consider a series system with two independent competing failure causes. Suppose that cause k has a Weibull distribution with parameters αk and ß_λ, k = 1, 2. Also, suppose that the cause of any failure is not identified.

(a) Give the log likelihood for a sample multiply censored on the right.

(b) Comment on the theoretical and numerical labor to obtain the ML estimates and asymptotic covariance matrix.

(d) Under the assumption ßI =& ß, can αI and az be estimated separately? Explain.

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Reference No.:- M91781002

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