\HeaderA{coxph.object}{Proportional Hazards Regression Object}{coxph.object}
\aliasA{print.coxph}{coxph.object}{print.coxph}
\aliasA{summary.coxph}{coxph.object}{summary.coxph}
\keyword{survival}{coxph.object}
\begin{Description}\relax
This class of objects is returned by the \code{coxph} class of functions
to represent a fitted proportional hazards model.


Objects of this class have methods for the functions \code{print},
\code{summary}, \code{residuals}, \code{predict} and \code{survfit}.
\end{Description}
\begin{Section}{COMPONENTS}
The following components must be included in a legitimate \code{coxph} object.
\describe{
\item[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.

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

\item[naive.var] this component will be present only if the \code{robust} option was true.  If so,
the \code{var} component will contain the robust estimate of variance, and this
component will contain the ordinary estimate.

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

\item[score] value of the efficient score test, at the initial value of the coefficients.

\item[rscore] the robust log-rank statistic, if a robust variance was requested.

\item[wald.test] the Wald test of whether the final coefficients differ from the initial values.

\item[iter] number of iterations used.

\item[linear.predictors] the vector of linear predictors, one per subject.

\item[residuals] the martingale residuals.

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

\item[n] the number of observations used in the fit.

\item[weights] the vector of case weights, if one was used.

\item[method] the computation method used.

\item[na.action] the \code{na.action} attribute, if any, that was returned by the \code{na.action} routine.


The object will also contain the following, for documentation see the \code{lm}
object: \code{terms}, \code{assign}, \code{formula}, \code{call}, and, optionally, \code{x}, \code{y},
and/or \code{frame}.
}
\end{Section}
\begin{SeeAlso}\relax
\code{\LinkA{coxph}{coxph}}, \code{\LinkA{coxph.detail}{coxph.detail}}, \code{\LinkA{cox.zph}{cox.zph}}, \code{\LinkA{survfit}{survfit}}, \code{\LinkA{residuals.coxph}{residuals.coxph}}, \code{\LinkA{survreg}{survreg}}
\end{SeeAlso}