#' @section RF variable:
#'
#' The `RF` variable refers to the *risk-free rate*. It depends on the period been
#' considered and on the country. For example, for U.S. monthly data series is the
#' one month *T-Bill* return.
#' The `RF` data series distributed by K. R. French with the Fama-French factors
#' data are usually obtained from *Ibbotson Associates Inc. (Morningstar)*.
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