#' @section Operating Profitability Ratio:
#'
#' The *operating profitability ratio* (OP) used to form portfolios in June of year
#' \eqn{t} is annual revenues minus cost of goods sold, interest expense, and selling,
#' general, and administrative expense divided by the sum of book equity and minority
#' interest for the last fiscal year ending in \eqn{t-1}.
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