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R/data_EFM.R
#' EFM
#'
#' The electronic fetal monitoring (EFM) and cesarean section (CS) dataset
#' from Neutra, Greenland, and Friedman (1980) consists of observations on 14,484 women
#' who delivered at Beth Israel Hospital, Boston from January 1970 to December 1975.
#' The purpose of the study is to evaluate the impact of EFM on cesarean section (CS) rates.
#' It is found by Neutra, Greenland, and Friedman (1980) that relevant confounding factors are:
#' nulliparity (nullipar), arrest of labor progression (arrest), malpresentation (breech), and year of study (year).
#' The dataset provided in the R package is from the supplementary materials of Richardson, Robins, and Wang (2017),
#' who used this dataset to illustrate their proposed methods
#' for modeling and estimating relative risk and risk difference.
#'
#' @references Neutra, R.R., Greenland, S. and Friedman, E.A., 1980.
#' Effect of fetal monitoring on cesarean section rates.
#' Obstetrics and gynecology, 55(2), pp.175-180.
#'
#' @references Richardson, T.S., Robins, J.M. and Wang, L., 2017.
#' On modeling and estimation for the relative risk and risk difference.
#' Journal of the American Statistical Association, 112(519), pp.1121-1130.
#'
#' @format A data frame with 14484 rows and 6 variables:
#' \describe{
#' \item{cesarean}{Outcome: 1 if delivery was via cesarean section; 0 otherwise}
#' \item{monitor}{Treatment: 1 if electronic fetal monitoring (EFM) was used; 0 otherwise}
#' \item{arrest}{Covariate: 1 = arrest of labor progression; 0 otherwise}
#' \item{breech}{Covariate: 1 = malpresentation (breech); 0 otherwise}
#' \item{nullipar}{Covariate: 1 = nulliparity; 0 otherwise}
#' \item{year}{Year of study: 0,...,5 (actual values are 1970,...,1975)}
#' }
#'
#' @source The dataset from Neutra, Greenland, and Friedman (1980) is available
#' as part of supplementary materials of Richardson, Robins, and Wang (2017)
#' on Journal of the American Statistical Association website at
#' \doi{10.1080/01621459.2016.1192546}.
"EFM"
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