Simulate survival times from standard parametric survival
distributions (exponential, Weibull, Gompertz), 2-component mixture
distributions, or a user-defined hazard, log hazard, cumulative hazard,
or log cumulative hazard function. Baseline covariates can be included
under a proportional hazards assumption.
Time dependent effects (i.e. non-proportional hazards) can be included by
interacting covariates with linear time or a user-defined function of time.
Clustered event times are also accommodated.
The 2-component mixture distributions can allow for a variety of flexible
baseline hazard functions reflecting those seen in practice.
If the user wishes to provide a user-defined
hazard or log hazard function then this is possible, and the resulting
cumulative hazard function does not need to have a closed-form solution.
Note that this package is modelled on the 'survsim' package available in
the 'Stata' software (see Crowther and Lambert (2012)
< http://www.stata-journal.com/sjpdf.html?articlenum=st0275> or
Crowther and Lambert (2013)