Package: extrafrail 1.15

extrafrail: Estimation and Additional Tools for Alternative Shared Frailty Models

Provide estimation and data generation tools for new multivariate frailty models. This version includes the gamma, inverse Gaussian, weighted Lindley, Birnbaum-Saunders, truncated normal, mixture of inverse Gaussian, mixture of Birnbaum-Saunders, generalized exponential, Jorgensen-Seshadri-Whitmore, weighted Akash, weighted Shanker and weighted Sujatha as the distribution for frailty terms. For the basal model, it is considered a parametric approach based on the exponential, Weibull and the piecewise exponential distributions as well as a semiparametric approach. For details, see Gallardo et al. (2024) <doi:10.1007/s11222-024-10458-w>, Gallardo et al. (2025) <doi:10.1002/bimj.70044>, Kiprotich et al. (2025) <doi:10.1177/09622802251338984>, Gallardo et al. (2025) <doi:10.1038/s41598-025-15903-y>, Kiprotich et al. (2026) <doi:10.1080/00949655.2025.2584734 and Mohammadi et al. (2026).

Authors:Diego Gallardo [aut, cre], Marcelo Bourguignon [aut], John Santibanez [ctb], Gilbert Kiprotich [ctb], Pedro Ramos [ctb], Thomas Augustin [ctb], Zohreh Mohammadi [ctb], Paulo Ferreira [ctb], Gerson Primo [ctb]