Extract Log-Likelihood from a Fitted Model

Extracts the log-likelihood function for a fitted parametric model.

Usage

# S3 method for class 'survstan'
logLik(object, ...)

Arguments

object

a fitted model of the class survstan

...

further arguments passed to or from other methods.

Value

the log-likelihood value when a single model is passed to the function; otherwise, a data.frame with the log-likelihood values and the number of parameters is returned.

Examples

# \donttest{
library(survstan)
fit1 <- aftreg(Surv(futime, fustat) ~ 1, data = ovarian, baseline = "weibull", init = 0)
fit2 <- aftreg(Surv(futime, fustat) ~ rx, data = ovarian, baseline = "weibull", init = 0)
fit3 <- aftreg(Surv(futime, fustat) ~ ecog.ps + rx, data = ovarian, baseline = "weibull", init = 0)
logLik(fit1, fit2, fit3)
#>    fit    loglik npars
#> 1 fit1 -12.60597     2
#> 2 fit3 -97.08449     4
#> 3 fit2 -97.36415     3
# }