# summary.coxph

##### Summary method for Cox models

Produces a summary of a fitted coxph model

- Keywords
- survival

##### Usage

```
# S3 method for coxph
summary(object, conf.int=0.95, scale=1,...)
```

##### Arguments

- object
the result of a coxph fit

- conf.int
level for computation of the confidence intervals. If set to FALSE no confidence intervals are printed

- scale
vector of scale factors for the coefficients, defaults to 1. The printed coefficients, se, and confidence intervals will be associated with one scale unit.

- …
for future methods

##### Value

An object of class `summary.coxph`

, with components:

number of observations and number of events, respectively, in the fit

the log partial likelihood at the initial and final values

a matrix with one row for each coefficient, and columns containing the coefficient, the hazard ratio exp(coef), standard error, Wald statistic, and P value.

a matrix with one row for each coefficient, containing the confidence limits for exp(coef)

the overall likelihood ratio, score, and Wald test statistics for the model

the concordance statistic and its standard error

whether an asymptotic or robust variance was used

an approximate R^2 based on Nagelkirke (Biometrika 1991).

a message, if the underlying coxph call failed

a copy of the call

information on missing values

##### Note

The pseudo r-squared of Nagelkirke is attractive because it is simple, but further work has shown that it has poor properties and it is now depricated. The value is no longer printed by default, and will eventually be removed from the object.

##### See Also

##### Examples

```
# NOT RUN {
fit <- coxph(Surv(time, status) ~ age + sex, lung)
summary(fit)
# }
```

*Documentation reproduced from package survival, version 3.1-8, License: LGPL (>= 2)*