#' Dose calibration of anti-epileptic drugs data
#'
#' @description The SANAD (Standard and New Anti-epileptic Drugs) study (Marson
#' et al., 2007) is a randomized control trial of standard and new
#' anti-epileptic drugs, comparing effects on longer term clinical outcomes.
#' The data consists of longitudinal measurements of calibrated dose for the
#' groups randomized to a standard drug (CBZ) and a new drug (LTG). The
#' objective of the analysis is to investigate the effect of drug titration on
#' the relative effects of LTG and CBZ on treatment failure (withdrawal of the
#' randomized drug). There are several baseline covariates available, and also
#' data on the time to withdrawal from randomized drug.
#'
#' @usage data(epileptic)
#' @format This is a data frame in the unbalanced format, that is, with one row
#' per observation. The data consists of columns for patient identifier, time
#' of measurement, calibrated dose, baseline covariates, and survival data.
#' The column names are identified as follows:
#'
#' \describe{
#'
#' \item{\code{id}}{integer: patient identifier.}
#'
#' \item{\code{dose}}{numeric: calibrated dose.}
#'
#' \item{\code{time}}{integer: timing of clinic visit at which dose recorded
#' (days).}
#'
#' \item{\code{with.time}}{integer: time of drug withdrawal/maximum follow up
#' time (days).}
#'
#' \item{\code{with.status}}{censoring indicator (\code{1 = }withdrawal of
#' randomized drug and \code{0 = }not withdrawn from randomized drug/lost to
#' follow up).}
#'
#' \item{\code{with.status2}}{censoring indicator (\code{1 = }withdrawal of
#' randomized drug due to inadequate seizure control, (\code{2 = }withdrawal
#' of randomized drug due to unacceptable adverse effects, and \code{0 = }not
#' withdrawn from randomized drug/lost to follow up).}
#'
#' \item{\code{with.status.uae}}{\code{1 = }withdrawal due to unacceptable
#' adverse effects, \code{0 = }otherwise.}
#'
#' \item{\code{with.status.isc}}{\code{1 = }withdrawal due to inadequate
#' seizure control, \code{0 = }otherwise.}
#'
#' \item{\code{treat}}{factor: randomized treatment (CBZ or LTG).}
#'
#' \item{\code{age}}{numeric: age of patient at randomization (years).}
#'
#' \item{\code{gender}}{factor: gender of patient. \code{F = }female, \code{M
#' = }male.}
#'
#' \item{\code{learn.dis}}{factor: learning disability.}
#'
#' }
#' @keywords datasets
#' @seealso \code{\link{heart.valve}}, \code{\link{liver}},
#' \code{\link{mental}}, \code{\link{aids}}.
#' @source SANAD Trial Group, University of Liverpool
#' @docType data
#' @references
#'
#' Marson AG, Appleton R, Baker GA, et al. A randomised controlled trial
#' examining longer-term outcomes of standard versus new antiepileptic drugs.
#' The SANAD Trial. \emph{Health Tech Assess}. 2007; \strong{11(37)}.
#'
#' Marson AG, Al-Kharusi AM, Alwaidh M, et al. The SANAD study of effectiveness
#' of carbamazepine, gabapentin, lamotrigine, oxcarbazepine, or topiramate for
#' treatment of partial epilepsy: an unblinded randomised controlled trial.
#' \emph{Lancet}. 2007; \strong{365}: 2007-2013.
#'
#' Williamson PR, Kolamunnage-Dona R, Philipson P, Marson AG. Joint modelling of
#' longitudinal and competing risks data. \emph{Stats Med.} 2008;
#' \strong{27(30)}: 6426-6438.
"epileptic"
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