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Article
Comparison of Two-Phase Analyses for Case-Control Genetic Association Studies
Statistics in Medicine (2008)
  • Gang Zheng
  • Mark J Meyer
  • Wentian Li
  • Yaning Yang
Abstract
To test for genetic association between a marker and a complex disease using a case-control design, Cochran-Armitage trend tests (CATTs) and Pearson's chi-square test are often employed. Both tests are genotype-based. Song and Elston (Statist. Med. 2006; 25:105-126) introduced the Hardy-Weinberg disequilibrium trend test and combined it with CATT to test for association. Compared to using a single statistic to test for case-control genetic association (referred to as single-phase analysis), two-phase analysis is a new strategy in that it employs two test statistics in one analysis framework, each statistic using all available case-control data. Two such two-phase analysis procedures were studied, in which Hardy-Weinberg equilibrium (HWE) in the population is a key assumption, although the procedures are robust to moderate departure from HWE. Our goal in this article is to study a new two-phase procedure and compare all three two-phase analyses and common single-phase procedures by extensive simulation studies. For illustration, the results are applied to real data from two case-control studies. On the basis of the results, we conclude that with an appropriate choice of significance level for the analysis in phase 1, some two-phase analyses could be more powerful than commonly used test statistics.
Keywords
  • adaptive approach,
  • constrained likelihood ratio test,
  • efficiency robustness,
  • genetic model selection,
  • MAX,
  • two-phase analysis
Publication Date
2008
Citation Information
Gang Zheng, Mark J Meyer, Wentian Li and Yaning Yang. "Comparison of Two-Phase Analyses for Case-Control Genetic Association Studies" Statistics in Medicine Vol. 27 (2008)
Available at: http://works.bepress.com/markjmeyer/2/