Define Parametric Mixture or Non-Mixture Cure Distribution
Source:R/surv_cure.r
define_surv_cure.RdDefine parametric mixture or not mixture cure distribution with given parameter values.
Usage
define_surv_cure(distribution, theta, ..., mixture = TRUE)
define_survival_cure(distribution, theta, ..., mixture = TRUE)Arguments
- distribution
A parametric survival distribution. See details for a listing of valid distributions.
- theta
A numeric value representing cure fraction
- ...
Additional distribution parameters (see details section below)
- mixture
a logical determining whether a mixture or non-mixture model is being defined.
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 | Parameterization from Prentice (1974) |
| "gengamma.orig" | Generalized Gamma (original) | shape, scale, k | Original parameterization from Stacy (1962) |
| "genf" | Generalized F (stable) | mu, sigma, Q, P | Stable reparameterization from Prentice (1975) |
| "genf.org" | Generalized F (original) | mu, sigma, s1, s2 | Origninal parameterization described by 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_cure(distribution = "exp", theta = 0.34, rate = .5)
#> An exponential mixture cure distribution (theta = 0.34, rate = 0.50).
define_surv_cure(
distribution = "weibull",
theta = 0.5, shape = 1.5,
scale = 34.43,
mixture = TRUE
)
#> A Weibull (AFT) mixture cure distribution (theta = 0.5, shape = 1.5, scale = 34.4).
# Deprecated alias included for backwards compatability with heRomod
define_survival_cure(distribution = "exp", theta = 0.24, rate = 0.023)
#> An exponential mixture cure distribution (theta = 0.240, rate = 0.023).