Define parametric survival distribution with given parameter values. A complete listing of supported distributions is provided in the details section.
Arguments
- distribution
a parametric survival distribution.
- ...
additional distribution parameters (see details section below)
Details
Supported distributions are listed in the table below.
| Distribution | Description | Parameters | Notes |
| "exp" | Exponential | rate | |
| "lnorm" | Lognormal | meanlog, sdlog | |
| "llogis" | Log-Logistic | shape, scale | |
| "weibull" | Weibull (AFT) | shape, scale | |
| "weibullPH" | Weibull (PH) | shape, scale | |
| "gompertz" | Gompertz | shape, rate | |
| "gamma" | Gamma | shape, scale | |
| "gengamma" | Generalized Gamma (stable) | mu, sigma, Q | Described in Prentice (1974) |
| "gengamma.orig" | Generalized Gamma (original) | shape, scale, k | Described in Stacy (1962) |
| "genf" | Generalized F (stable) | mu, sigma, Q, P | Described in Prentice (1975) |
| "genf.org" | Generalized F (original) | mu, sigma, s1, s2 | Described in Prentice (1975) |
References
Stacy, E. W. (1962). A generalization of the gamma distribution. Annals of Mathematical Statistics 33:1187-92.
Prentice, R. L. (1974). A log gamma model and its maximum likelihood estimation. Biometrika 61(3):539-544.
R. L. Prentice (1975). Discrimination among some parametric models. Biometrika 62(3):607-614.
Examples
define_surv_param(distribution = "exp", rate = .5)
#> An exponential distribution (rate = 0.5).
define_surv_param(distribution = "gompertz", rate = .5, shape = 1)
#> A Gompertz distribution (shape = 1.0, rate = 0.5).
# Deprecated alias included for backwards compatability with heRomod
define_survival(distribution = "exp", rate = 0.05)
#> An exponential distribution (rate = 0.05).