coxph.object {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`.

### Arguments

`coefficients` | the vector of coefficients. 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. Note that this vector has been centered, see `predict.coxph` for more details.
`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.
`nevent` | the number of events (usually deaths) used in the fit.
`concordance` | the concordance, as computed by survConcordance.
`first` | the first derivative vector at the solution.
`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`.

### Components

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

### See Also

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

[Package survival version 2.39-4 Index]