#' AIDS drug trial data
#'
#' @description This dataset describes a randomized clinical trial (Goldman et
#' al., 1996) in which both survival and longitudinal data were collected to
#' compare the efficacy and safety of two antiretroviral drugs, namely ddI
#' (didanosine) and ddC (zalcitabine), in treating HIV-infected patients
#' intolerant or failing zidovudine (AZT) therapy.
#'
#' @usage data(aids)
#' @format A \code{data.frame} in the unbalanced format with 1405 longitudinal
#' observations from 467 subjects. The columns are:
#'
#' \describe{
#'
#' \item{\code{id}}{integer: number for patient identification.}
#'
#' \item{\code{time}}{numeric: time to death (or censoring).}
#'
#' \item{\code{death}}{integer: event indicator. Coded as \code{0 =
#' }right-censoring, and \code{1 = }death.}
#'
#' \item{\code{obstime}}{numeric: measurement times for the repeated CD4 count
#' measurements.}
#'
#' \item{\code{CD4}}{numeric: CD4 cell counts measured at \code{obstime}.}
#'
#' \item{\code{drug}}{factor: drug indicator. Coded as \code{ddI = }didanosine
#' and \code{ddC = }zalcitabine.}
#'
#' \item{\code{gender}}{factor: gender indicator. Coded as \code{male} and
#' \code{female}.}
#'
#' \item{\code{prevOI}}{factor: opportunistic infection indicator. Coded as
#' \code{AIDS = }AIDS diagnosis at study entry, and \code{noAIDS = }no
#' previous infection.}
#'
#' \item{\code{AZT}}{factor: AZT intolerance/failure indicator. Coded as
#' \code{intolerance} or \code{failure}.}
#' }
#' @keywords datasets
#' @seealso \code{\link{heart.valve}}, \code{\link{epileptic}},
#' \code{\link{mental}}, \code{\link{liver}}.
#' @source Guo X, Carlin B. Separate and joint modeling of longitudinal and
#' event time data using standard computer packages.
#' \emph{The American Statistician}. 2004; \strong{58}: 16-24
#' @docType data
#' @references
#'
#' Goldman A, Carlin B, Crane L, Launer C, Korvick J, Deyton L, Abrams D.
#' Response of CD4 and clinical consequences to treatment using ddI or ddC in
#' patients with advanced HIV infection. \emph{Journal of Acquired Immune
#' Deficiency Syndromes and Human Retrovirology}. 1996; \strong{11}: 161-169
#' URL: \url{http://www.biostat.umn.edu/~brad/data.html}.
"aids"
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