\HeaderA{survreg.object}{Parametric Survival Model Object}{survreg.object}
\aliasA{print.survreg}{survreg.object}{print.survreg}
\aliasA{summary.survreg}{survreg.object}{summary.survreg}
\keyword{regression}{survreg.object}
\keyword{survival}{survreg.object}
\begin{Description}\relax
This class of objects is returned by the \code{survreg} function
to represent a fitted parametric survival model.
Objects of this class have methods for the functions \code{print},
\code{summary}, \code{predict}, and \code{residuals}.
\end{Description}
\begin{Section}{COMPONENTS}
The following components must be included in a legitimate \code{survreg} object.
\describe{
\item[coefficients] the coefficients of the \code{linear.predictors}, which multiply  the
columns of the model
matrix.
It does not include the estimate of error (sigma).
The names of the coefficients are the names of the
single-degree-of-freedom effects (the columns of the
model matrix).
If the model is over-determined there will
be missing values in the coefficients corresponding to non-estimable
coefficients.

\item[icoef] coefficients of the baseline model, which will contain the intercept
and log(scale), or mulitple scale factors for a stratified model.

\item[var] the variance-covariance matrix for the parameters, including the log(scale)
parameter(s).

\item[loglik] a vector of length 2, containing the log-likelihood for the baseline and
full models. 

\item[iter] the number of iterations required

\item[linear.predictors] the linear predictor for each subject.

\item[df] the degrees of freedom for the final model.  For a penalized model
this will be a vector with one element per term.

\item[scale] the scale factor(s), with length equal to the number of strata.

\item[idf] degrees of freedom for the initial model.

\item[means] a vector of the column means of the coefficient matrix.

\item[dist] the distribution used in the fit.


The object will also have the following components found in 
other model results (some are optional):
\code{linear predictors}, \code{weights}, \code{x}, \code{y}, \code{model}, 
\code{call}, \code{terms} and \code{formula}.
See \code{lm}.
}
\end{Section}
\begin{SeeAlso}\relax
\code{\LinkA{survreg}{survreg}}, \code{\LinkA{lm}{lm}}
\end{SeeAlso}