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#' Network meta-analysis of interventions for smoking cessation
#'
#' @description
#' Network meta-analysis comparing the effects of a number of
#' interventions for smoking cessation.
#'
#' These data are used as an example in Dias et al. (2013), page 651.
#'
#' @name smokingcessation
#'
#' @docType data
#'
#' @format
#' A data frame with the following columns:
#' \tabular{rl}{
#' \bold{\emph{event1}}\tab number of individuals with successful
#' smoking cessation in arm 1 \cr
#' \bold{\emph{n1}}\tab number of individuals in arm 1 \cr
#' \bold{\emph{event2}}\tab number of individuals with successful
#' smoking cessation in arm 2 \cr
#' \bold{\emph{n2}}\tab number of individuals in arm 2 \cr
#' \bold{\emph{event3}}\tab number of individuals with successful
#' smoking cessation in arm 3 \cr
#' \bold{\emph{n3}}\tab number of individuals in arm 3 \cr
#' \bold{\emph{treat1}}\tab treatment 1 \cr
#' \bold{\emph{treat2}}\tab treatment 2 \cr \bold{\emph{treat3}}\tab
#' treatment 3
#' }
#'
#' @seealso \code{\link{pairwise}}, \code{\link{metabin}},
#' \code{\link{netmeta}}, \code{\link{netgraph.netmeta}}
#'
#' @source
#' Dias S, Welton NJ, Sutton AJ, Caldwell DM, Lu G and Ades AE (2013):
#' Evidence Synthesis for Decision Making 4: Inconsistency in networks
#' of evidence based on randomized controlled trials.
#' \emph{Medical Decision Making},
#' \bold{33}, 641--56
#'
#' @keywords datasets
#'
#' @examples
#' data(smokingcessation)
#'
#' # Transform data from arm-based format to contrast-based format
#' # Argument 'sm' has to be used for odds ratio as summary measure;
#' # by default the risk ratio is used in the metabin function called
#' # internally.
#' #
#' p1 <- pairwise(list(treat1, treat2, treat3),
#' event = list(event1, event2, event3), n = list(n1, n2, n3),
#' data = smokingcessation, sm = "OR")
#' p1
#'
#' # Conduct network meta-analysis
#' #
#' net1 <- netmeta(p1)
#' net1
#'
#' # Draw network graph
#' #
#' netgraph(net1, points = TRUE, cex.points = 3, cex = 1.25)
#' tname <- c("No intervention", "Self-help",
#' "Individual counselling", "Group counselling")
#' netgraph(net1, points = TRUE, cex.points = 3, cex = 1.25, labels = tname)
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