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#' Schoenfeld's formula
#'
#' @description Schoenfeld's formula to calculate the number of events required
#' @export
#' @keywords internal
#'
#'
#'
schoenfeld_formula <- function(alpha,power,HR) E <- 4*(qnorm(1-alpha/2) + qnorm(power))^2 / (log(HR))^2
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