#' @section CMA factor:
#'
#' The `CMA` (*Conservative Minus Aggressive*) is the average return on the two
#' conservative investment portfolios minus the average return on the two aggressive
#' investment portfolios,
#'
#' \deqn{CMA = \frac{1}{2}[(Small Conservative + Big Conservative) - (Small Aggressive + Big Aggressive)]}
#'
#' [K. R. French's Detail for Investment Breakpoints](https://mba.tuck.dartmouth.edu/pages/faculty/ken.french/Data_Library/det_inv_breakpoints.html)
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