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. The method is generally rejected by linguists (Campbell 2001, p. 45), though it has some supporters.
In spite of widespread skepticism about his method, some of the relationships established by Greenberg gradually came to be generally accepted (e.g. Afro-Asiatic and Niger–Congo). Others are widely accepted though disputed by some (e.g. Nilo-Saharan), others are predominantly rejected but have some defenders (e.g. Khoisan), while others continue to be widely rejected and have only a handful of defenders (e.g. Amerind).
The application of mass comparison led Greenberg not only to propose novel classifications but to break apart previously accepted ones. The best-known example is his rejection of the Hamitic language family.
Read more about Mass Comparison: Theory of Mass Comparison, The Disputed Legacy of The Comparative Method, Toward A Resolution of The Conflict?
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