Extract the variance covariance matrix of the beta from a Cox model
coxVarCov(object)# S3 method for cph
coxVarCov(object)
# S3 method for coxph
coxVarCov(object)
# S3 method for phreg
coxVarCov(object)
The fitted Cox regression model object either
obtained with coxph
(survival package), cph
(rms package), or phreg
(mets package).
Should return NULL
if the Cox model has no covariate.
The rows and columns of the variance covariance matrix must be named with the names used in the design matrix.