vcov.survstan {survstan} | R Documentation |
Variance-covariance matrix
Description
This function extracts and returns the variance-covariance matrix associated with the regression coefficients when the maximum likelihood estimation approach is used in the model fitting.
Usage
## S3 method for class 'survstan'
vcov(object, all = FALSE, ...)
Arguments
object |
an object of the class survstan. |
all |
logical; if FALSE (default), only covariance matrix associated with regression coefficients is returned; if TRUE, the full covariance matrix is returned. |
... |
further arguments passed to or from other methods. |
Value
the variance-covariance matrix associated with the parameters estimators.
Examples
library(survstan)
fit <- aftreg(Surv(futime, fustat) ~ ecog.ps + rx, data = ovarian, baseline = "weibull", init = 0)
vcov(fit)
[Package survstan version 0.0.7.1 Index]