\HeaderA{coxph.object}{Proportional Hazards Regression Object}{coxph.object}
\aliasA{extractAIC.coxph.penal}{coxph.object}{extractAIC.coxph.penal}
\aliasA{print.coxph}{coxph.object}{print.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{Arguments}
\begin{ldescription}
\item[\code{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[\code{var}] the variance matrix of the coefficients.  Rows and columns corresponding to 
any missing coefficients are set to zero. 

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

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

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

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

\item[\code{iter}] number of iterations used. 

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

\item[\code{residuals}] the martingale residuals. 

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

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

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

\item[\code{method}] the computation method used. 

\item[\code{na.action}] the 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{ldescription}
\end{Arguments}
\begin{Section}{Components}
The following components must be included in a legitimate \code{coxph} 
object.
\end{Section}
\begin{SeeAlso}\relax
\code{\LinkA{coxph}{coxph}},  \code{\LinkA{coxph.detail}{coxph.detail}},  \code{\LinkA{cox.zph}{cox.zph}},  \code{\LinkA{residuals.coxph}{residuals.coxph}},  \code{\LinkA{survfit}{survfit}},  \code{\LinkA{survreg}{survreg}}.
\end{SeeAlso}

