[R] Error of Cox model

I have a set of parameter estimates for a multivariable Cox model predicting survival duration and a data-frame of new measurements for the variables in the model, as well as the actual survival duration. Is there a function to estimate the error the model has on predicting survival on this new se

[R] Error of Cox model

I have a set of parameter estimates for a multivariable Cox model predicting survival duration and a data-frame of new measurements for the variables in the model, as well as the actual survival duration. Is there a function to estimate the error the model has on predicting survival on this new se