U bɛ mɔralite ɲayiralifɛnw ladɔn (ka fara ɲɛnamaya tabali, Gompertz ka ɲayiralifɛnw, latigɛw ka ɲayiralifɛnw, Kox tilancɛ latigɛw ka ɲariyalifɛnw, ka caman tigɛ ka bɔ ɲɛnamaya tabaliw la, lɔzitiw ka rɛlasiɔn ni zira yɛ), bangeli (Hernes ka ɲayiralifɛn, Coale-Trussell ka ɲayiralifɛnw, pariti ka ɲɛtaga rasios), furu (Kɛlɛnya kɔrɔ furu la, gafe fura ɲayiralifɛn), lujuratoya (Sullivan ka fɛɛrɛsira, jamana caman ka diɲɛlatigɛ tabaliw), fasojama jaboliw (Lee-Carter ka ɲɛyiralifɛn, Leslie ka Matrikisi), ani fasojama mɔmantumu (Keyfitz).