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\name{survsplit}
\alias{survsplit}
\title{Split a Survival Data Set at Specified Times}
\description{
Given a survival data set and a set of specified cut times, the function splits
each record into multiple records at each cut time. The new data
set is be in \code{counting process} format, with a start time, stop
time, and event status for each record. More general than \code{survSplit}
as it also works with the data already in the \code{counting process} format.
}
\usage{
survsplit(data, cut, end, event, start, id = NULL, zero = 0,
episode = NULL,interval=NULL)
}
\arguments{
\item{data}{data frame. }
\item{cut}{vector of timepoints to cut at.}
\item{end}{character string with name of event time variable. }
\item{event}{character string with name of censoring indicator. }
\item{start}{character string with name of start variable (will be
created if it does not exist). }
\item{id}{character string with name of new id variable to create
(optional). }
\item{zero}{If \code{start} doesn't already exist, this is the time
that the original records start. May be a vector or single value. }
\item{episode}{character string with name of new episode variable (optional).}
\item{interval}{this argument is used by \code{max.lik} function}
}
\value{New, longer, data frame.}
\seealso{\code{\link{survSplit}}.}
\keyword{survival}
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