coxph.object            package:survival            R Documentation

Proportional Hazards Regression Object

Description:

     This class of objects is returned by the 'coxph' class of
     functions to represent a fitted proportional hazards model.

     Objects of this class have methods for the functions 'print',
     'summary', 'residuals', 'predict' and 'survfit'.

COMPONENTS:

     The following components must be included in a legitimate 'coxph'
     object.

     coefficients the coefficients of the linear predictor, which
          multiply the columns of the model matrix.  If the model is
          over-determined there will be missing values in the vector
          corresponding to the redundant columns in the model matrix.

     var the variance matrix of the coefficients.  Rows and columns
          corresponding to any missing coefficients are set to zero.

     naive.var this component will be present only if the 'robust'
          option was true.  If so, the 'var' component will contain the
          robust estimate of variance, and this component will contain
          the ordinary estimate.

     loglik a vector of length 2 containing the log-likelihood with the
          initial values and with the final values of the coefficients.

     score value of the efficient score test, at the initial value of
          the coefficients.

     rscore the robust log-rank statistic, if a robust variance was
          requested.

     wald.test the Wald test of whether the final coefficients differ
          from the initial values.

     iter number of iterations used.

     linear.predictors the vector of linear predictors, one per
          subject.

     residuals the martingale residuals.

     means vector of column means of the X matrix.  Subsequent survival
          curves are adjusted to this value.

     n the number of observations used in the fit.

     weights the vector of case weights, if one was used.

     method the computation method used.

     na.action the 'na.action' attribute, if any, that was returned by
          the 'na.action' routine.

          The object will also contain the following, for documentation
          see the 'lm' object: 'terms', 'assign', 'formula', 'call',
          and, optionally, 'x', 'y', and/or 'frame'.

See Also:

     'coxph', 'coxph.detail', 'cox.zph', 'survfit', 'residuals.coxph',
     'survreg'

