title: The number of families required for detecting the familial aggregation of a continuous attribute.
abstract: 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.
mesh_terms: D000704:Analysis of Variance; D004812:Epidemiologic Methods; D005190:Family; D005191:Family Characteristics; D006801:Humans; D011336:Probability