UKmortality             General population survival data.
counted_prevalence      Count prevalence from registry data.
draw_incident_population
                        Simulates an incident population according to a
                        specific incidence model
extract_covars          Returns the name of the covariates in the
                        registry data set that are required by the
                        survival model.
fixed_cure              Builds survival models for diseases with cured
                        fractions using population mortality tables
plot.incdiag            Visualise disease incidence.
plot.survfit.prev       Plot bootstrapped survival curves.
predict_survival_probability
                        Predicts survival probability for given
                        individuals at specific times.
prevalence              Estimate point prevalence at an index date.
prevsim                 Simulated patient dataset.
sim_prevalence          Estimate prevalence using Monte Carlo
                        simulation.
summary.survfit.prev    Obtain N-year survival probability estimates.
survfit.prevalence      Form bootstrapped survival curves.
test_homogeneity        Inspects disease incidence for its
                        compatibility with a homogeneous Poisson
                        process.
test_prevalence_fit     Test simulated prevalence fit.
validate_incidence_model
                        Tests custom incidence models
validate_survival_model
                        Tests that a custom survival object has the
                        required attributes for use in the 'prevalence'
                        function.
