\HeaderA{coxph.control}{Ancillary arguments for controling coxph fits}{coxph.control}
\keyword{survival}{coxph.control}
\begin{Description}\relax
This is used to set various numeric parameters controling a Cox model fit.
Typically it would only be used in a call to \code{coxph}.
\end{Description}
\begin{Usage}
\begin{verbatim}
coxph.control(eps = 1e-08, toler.chol = .Machine$double.eps^0.75, iter.max = 15, toler.inf = sqrt(eps), outer.max = 10)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{eps}] Iteration continues until the relative change in the log partial
likelihood is less than eps.  Must be positive.
\item[\code{toler.chol}] Tolerance for detection of singularity during a Cholesky
decomposion of the variance matrix, i.e., for detecting a redundant predictor
variable.
\item[\code{iter.max}] Maximum number of iterations to attempt for convergence.
\item[\code{toler.inf}] Tolerance criteria for the warning message about a possible
infinite coefficient value.
\item[\code{outer.max}] For a penalized coxph model, e.g. with pspline terms, there
is an outer loop of iteration to determine the penalty parameters; maximum
number of iterations for this outer loop.
\end{ldescription}
\end{Arguments}
\begin{Value}
a list containing the values of each of the above constants
\end{Value}
\begin{Author}\relax
Terry Therneau
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{coxph}{coxph}}
\end{SeeAlso}

