Nonrandom sampling in genetic epidemiology: maximum likelihood methods for multifactorial analysis of quantitative data ascertained through truncation

Genetic Epidemiology
D C Rao, R Wette

Abstract

Three types of nonrandom sampling of family data are described, and appropriate maximum likelihood methods are proposed for each. The three types arise depending on whether the selection of probands, based on truncation, is applied directly to the phenotypic distribution, to the distribution of a correlated trait, or to the liability distribution of an associated disease. Family data ascertained through random and nonrandom sampling can be analyzed together in a unified approach. Results of a Monte Carlo study are presented that demonstrate the utility of the proposed methods. In particular, likelihood ratio tests of null hypotheses are shown to be distributed as chi-square, even in samples as small as 50 families (with variable sibship size).

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Citations

Jan 1, 1991·Genetic Epidemiology·K Y Liang, T H Beaty
Jan 1, 1988·Genetic Epidemiology·J L Hopper
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Apr 20, 1999·Genetic Epidemiology·H SniederM C Neale
Jan 1, 1990·The British Journal of Psychiatry : the Journal of Mental Science·M T TsuangS V Faraone

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