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#' Convert d to correlation coefficient
#'
#' This function allows you to convert d to Pearson's
#' correlation coefficient.
#'
#' @param d the effect size to convert
#' @return correlation coefficient
#'
#' @keywords effect size cohen's d convert correlation
#'
#' @examples
#' d_to_r(.25)
#'
#' @rdname d_to_r
#' @export
#'
d_to_r <- function (d) {
if (missing(d)){
stop("Be sure to include d.")
}
return(d / sqrt((d^2+4)))
}
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