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American Journal of Epidemiology Vol. 108, No. 5: 425-428
Copyright © 1978 by The Johns Hopkins University School of Hygiene and Public Health

other

THE NUMBER OF FAMILIES REQUIRED FOR DETECTING THE FAMILIAL AGGREGATION OF A CONTINUOUS ATTRIBUTE

ALLAN DONNER1

1 Department of Epidemiology and Preventive Medicine, The University of Western Ontario London, Ontario, Canada, N6A 5B7

1Address reprint requests to Dr. Donner at this address.

A formula Is presented and graphs are displayed that provide the approximate power of a test for intraclass correlation. The results are useful for estimating the number of families required for detecting the familial aggregation of a continuous attribute.

biometry; family characteristics; statistics


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