Idf was introduced as "expression specificity" by Karen Spärck Jones in the 1972 paper. Although it has labored perfectly for a heuristic, its theoretical foundations have been troublesome for a minimum of three a long time afterward, with many scientists looking to discover information and facts theoretic justifications for it.[7] https://working-capital-optimiz29628.blogdigy.com/5-simple-statements-about-dynamic-discounting-explained-58742754