Birnbaum-Saunders nonlinear regression models

Details Birnbaum-Saunders nonlinear regression models Birnbaum-Saunders nonlinear regression models

2009-01-30

arxiv.org/abs/0901.4881v2

Statistics

Methodology

Scientific paper

10.1016/j.csda.2009.06.015

We introduce, for the first time, a new class of Birnbaum-Saunders nonlinear regression models potentially useful in lifetime data analysis. The class generalizes the regression model described by Rieck and Nedelman [1991, A log-linear model for the Birnbaum-Saunders distribution, Technometrics, 33, 51-60]. We discuss maximum likelihood estimation for the parameters of the model, and derive closed-form expressions for the second-order biases of these estimates. Our formulae are easily computed as ordinary linear regressions and are then used to define bias corrected maximum likelihood estimates. Some simulation results show that the bias correction scheme yields nearly unbiased estimates without increasing the mean squared errors. We also give an application to a real fatigue data set.

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