#' Example data for a meta-analysis of dichotomous outcomes: Exercise-based cardiac rehabilitation
#'
#' A dataset consisting of 14 empirical studies used for a meta-analysis in
#' Anderson et al. (2016). The outcome of interest was risk of hospital admission of patients
#' with coronary heart disease within follow up duration. Compared was
#' exercise-based cardiac rehabilitation (treatment) with usual care (control).
#'
#' @format A data frame with 14 rows and 15 variables:
#' \describe{
#' \item{study_name}{short name of each study}
#' \item{year}{publication year of each study}
#' \item{ai}{number of patients in the treatment group with an event (hospital admission) for each study.}
#' \item{bi}{number of patients in the treatment group with no event for each study.}
#' \item{ci}{number of patients in the control group with an event (hospital admission) for each study.}
#' \item{di}{number of patients in the control group with no event for each study.}
#' \item{n1i}{number of patients in the treatment group for each study, (ai + bi).}
#' \item{n2i}{number of patients in the control group for each study, (ci + di).}
#' \item{rr}{relative risk of an event for treatment vs. control, (ai/n1i)/(ci/n2i).}
#' \item{or}{odds ratio of an event for treatment vs. control, (ai*di)/(bi*ci).}
#' \item{logrr}{natural logarithm of the relative risk (\code{rr}) for meta-analysis.}
#' \item{logrr_se}{standard error of the natural logarithm of the relative risk for meta-analysis, sqrt(1/ai + 1/ci - 1/(ai + bi) - 1/(ci + di)).}
#' \item{logor}{natural logarithm of the odds ratio (\code{or}) for meta-analysis.}
#' \item{logor_se}{standard error of the natural logarithm of the odds ratio for meta-analysis, sqrt(1/ai + 1/bi +1/ci + 1/di).}
#' \item{followup}{dichotomous moderator: follow up duration.}
#' }
#' @references Anderson, L., Oldridge, N., Thompson, D. R., Zwisler, A. D., Rees, K.,
#' Martin, N., & Taylor, R. S. (2016). Exercise-based cardiac rehabilitation for coronary
#' heart disease: Cochrane systematic review and meta-analysis.
#' \emph{Journal of the American College of Cardiology}, \emph{67}, 1-12.
"exrehab"
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