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#' @title viagra data from textbook
#' @docType data
#' @keywords datasets
#' @name viagra
#' @usage data(viagra)
#' @format A data frame with 15 rows and 2 variables:
#' \describe{
#' \item{dose}{Level of viagra dose}
#' \item{libido}{Libido after taking viagra}
#' }
#' @description A data set from Field et al (2012)
#' @references Field, A., Miles, J., & Field, Z. (2012) Discovering Statistics Using R. Sage: Chicago.
#' @source \url{https://studysites.sagepub.com/dsur/study/}
"viagra"
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