Comparison of variance components and sibpair-based approaches to quantitative trait linkage analysis in unselected samples

Jeff T. Williams, John Blangero

    Research output: Contribution to journalArticlepeer-review

    54 Scopus citations

    Abstract

    We compared the statistical performance of sibpair-based and variance components approaches to multipoint linkage analysis of a quantitative trait in unselected samples. As a benchmark dataset, we used the simulated family data from Genetic Analysis Workshop 10 [Goldin et al., 1997], and each method was used to screen all 200 replications of the GAW10 genome for evidence of linkage to quantitative trait Q1. The sibpair and variance components methods were each applied to datasets comprising single-sibpairs and complete sibships, and for further comparison we also applied the variance components method to the nuclear family and extended pedigree datasets. For each analysis, the unbiasedness and efficiency of parameter estimation, the power to detect linkage, and the Type I error rate were estimated empirically. Sibpair and variance components methods exhibited comparable performance in terms of the unbiasedness of the estimate of QTL location and the Type I error rate. Within the single-sibpair and sibship sampling units, the variance components approach gave consistently superior power and efficiency of parameter estimation. Within each method, the statistical performance was improved by the use of the larger and more informative sampling units.

    Original languageEnglish (US)
    Pages (from-to)113-134
    Number of pages22
    JournalGenetic epidemiology
    Volume16
    Issue number2
    DOIs
    StatePublished - 1999

    Keywords

    • Power
    • Relative efficiency
    • Statistical genetics
    • Type I error rate
    • Unbiasedness

    ASJC Scopus subject areas

    • Epidemiology
    • Genetics(clinical)

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