Mass comparison

Mass comparison is a method developed by Joseph Greenberg to determine the level of genetic relatedness between languages. It is now usually called multilateral comparison. Mass comparison is rejected by most linguists, and its continued use is primarily restricted to fringe linguistics.

Some of the top-level relationships Greenberg named are now generally accepted thanks to analysis with other, more widely accepted linguistic techniques, though they had already been posited by others (e.g. Afro-Asiatic and Niger–Congo). Others are accepted by many though disputed by some prominent specialists (e.g. Nilo-Saharan), while others are almost universally rejected (e.g. Eurasiatic, Khoisan and Amerind).