coxph.object {survival} | R Documentation |

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`

.

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`

.

`coxph`

, `coxph.detail`

, `cox.zph`

, `survfit`

, `residuals.coxph`

, `survreg`

[Package *survival* version 2.20 Index]