R/toenail.R

In mice: Multivariate Imputation by Chained Equations

#' Toenail data
#'
#' The toenail data come from a Multicenter study comparing two oral
#' treatments for toenail infection. Patients were evaluated for the
#' degree of separation of the nail. Patients were randomized into two
#' treatments and were followed over seven visits - four in the first
#' year and yearly thereafter. The patients have not been treated
#' prior to the first visit so this should be regarded as the
#' baseline.
#' @name toenail
#' @docType data
#' @format A data frame with 1908 observations on the following 5 variables:
#'   \describe{
#'   \item{\code{ID}}{a numeric vector giving the ID of patient}
#'   \item{\code{outcome}}{a numeric vector giving the response
#'   (0=none or mild seperation, 1=moderate or severe)}
#'   \item{\code{treatment}}{a numeric vector giving the treatment group}
#'   \item{\code{month}}{a numeric vector giving the time of the visit
#'   (not exactly monthly intervals hence not round numbers)}
#'   \item{\code{visit}}{a numeric vector giving the number of the visit}
#'   }
#' @source
#' De Backer, M., De Vroey, C., Lesaffre, E., Scheys, I., and De
#' Keyser, P. (1998). Twelve weeks of continuous oral therapy for
#' toenail onychomycosis caused by dermatophytes: A double-blind
#' comparative trial of terbinafine 250 mg/day versus itraconazole 200
#' mg/day. Journal of the American Academy of Dermatology, 38, 57-63.
#' @references
#' Lesaffre, E. and Spiessens, B. (2001). On the effect of the number of
#' quadrature points in a logistic random-effects model: An example.
#' Journal of the Royal Statistical Society, Series C, 50, 325-335.
#'
#' G. Fitzmaurice, N. Laird and J. Ware (2004) Applied Longitudinal Analysis,
#' Wiley and Sons, New York, USA.
#'
#' Van Buuren, S. (2018).
#' \href{https://stefvanbuuren.name/fimd/sec-catoutcome.html#example}{\emph{Flexible
#' Imputation of Missing Data. Second Edition.}} Chapman & Hall/CRC.
#' Boca Raton, FL.
#' @keywords datasets
#' @seealso \code{\link{toenail2}}
#' @details This dataset was copied from the \code{DPpackage}, which is
#' scheduled to be discontinued from CRAN in August 2019.
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