Abstract
In this paper, we extend the unified class of Box–Cox transformation (BCT) cure rate models to accommodate interval-censored data. The probability of cure is modeled using a general covariate structure, whereas the survival distribution of the uncured is modeled through a proportional hazards structure. We develop likelihood inference based on the expectation maximization (EM) algorithm for the BCT cure model. Within the EM framework, both simultaneous maximization and profile likelihood are addressed with respect to estimating the BCT transformation parameter. Through Monte Carlo simulations, we demonstrate the performance of the proposed estimation method through calculated bias, root mean square error, and coverage probability of the asymptotic confidence interval. Also considered is the efficacy of the proposed EM algorithm as compared to direct maximization of the observed log-likelihood function. Finally, data from a smoking cessation study is analyzed for illustrative purpose.
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Data availability
The R codes for the data generation and the EM algorithm are available in the Supplemental Material. The R codes are also available in GitHub: https://github.com/suvrapal/Transformation-Cure-IC.
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Acknowledgements
Our sincere thanks go to the Associate Editor and two anonymous reviewers for their useful comments and suggestions on an earlier version of this manuscript which led to this improved version.
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This research was supported by the National Institute Of General Medical Sciences of the National Institutes of Health under Award Number R15GM150091. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Treszoks, J., Pal, S. Likelihood inference for unified transformation cure model with interval censored data. Comput Stat (2024). https://doi.org/10.1007/s00180-024-01480-7
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DOI: https://doi.org/10.1007/s00180-024-01480-7