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National Center for Education Statistics (ED), Washington, DC. – 1980
The Twins and Siblings study is available in a machine-readable data file that is part of the High School and Beyond (HSB) Class of 1980 Survey, administered in 1980 to a national sample of over 30,000 sophomores and 28,000 seniors from 1,015 high schools throughout the United States. This file contains data from 616 sampled twins and triplets…
Descriptors: Cognitive Tests, Databases, Family Characteristics, Grade 10