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assortative

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assortative /as·sor·ta·tive/ (ah-sor´tah-tiv) characterized by or pertaining to selection on the basis of likeness or kind.

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This strategy allowed us to represent a wide range of mixing patterns in the matrix, from fully assortative (as for persons with like persons when parameter is zero) to proportionate (random partners when parameter is 1) mixing (1,2,8,9).
This decline in husband-wife families, the Brookings economist Gary Burtless recently argued, accounts for 21 percent of the increase in economic inequality between 1979 and 1996 (the increase in assortative mating--high-earners marrying other high-earners, low-earners marrying other low-earners--accounts for another 13 percent).
Called assortative mating, this is a critical factor in maintaining genetic differences among geographically mingled races.
 
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