ABSTRACT
A general procedure is developed for bias-correcting the maximum likelihood estimators (MLEs) of the parameters of Weibull regression model with either complete or right-censored data. Following the bias correction, variance corrections and hence improved t-ratios for model parameters are presented. Potentially improved t-ratios for other reliability-related quantities are also discussed. Simulation results show that the proposed method is effective in correcting the bias of the MLEs, and the resulted t-ratios generally improve over the regular t-ratios.
Acknowledgements
We are grateful to the Editor, Professor Richard Krutchkoff, an Associate Editor and two anonymous referees for the helpful comments that have led to significant improvements in the paper.
Disclosure statement
No potential conflict of interest was reported by the authors.