hesim_survdists {hesim} | R Documentation |
List of survival distributions
Description
List of additional distributions for parametric survival analysis that are
not contained in flexsurv
. Can be used to fit models with
flexsurv::flexsurvreg()
. Same format as flexsurv::flexsurv.dists
.
Usage
hesim_survdists
Format
A list with the following elements:
- name
Name of the probability distribution.
- pars
Vector of strings naming the parameters of the distribution. These must be the same names as the arguments of the density and probability functions.
- location
Name of the location parameter.
- transforms
List of R functions which transform the range of values taken by each parameter onto the real line. For example,
c(log, log)
for a distribution with two positive parameters.- inv.transforms
List of R functions defining the corresponding inverse transformations. Note these must be lists, even for single parameter distributions they should be supplied as, e.g.
c(exp) or list(exp)
.- inits
A function of the observed survival times
t
(including right-censoring times, and using the halfway point for interval-censored times) which returns a vector of reasonable initial values for maximum likelihood estimation of each parameter. For example,function(t){ c(1, mean(t)) }
will always initialize the first of two parameters at 1, and the second (a scale parameter, for instance) at the mean oft
.