Joint Analysis of Binary and Quantitative Traits With Data Sharing and Outcome-Dependent Sampling

Title
Joint Analysis of Binary and Quantitative Traits With Data Sharing and Outcome-Dependent Sampling
Author(s)
곽민정Gang Zheng[Gang Zheng]Colin Wu[Colin Wu]Wenhua Jiang[Wenhua Jiang]Jungnam Joo[Jungnam Joo]Joao A.C. Lima[Joao A.C. Lima]
Keywords
RHEUMATOID-ARTHRITIS; LINKAGE DISEQUILIBRIUM; P-VALUES; ASSOCIATION; ANTIBODIES; TESTS; SIZE; LOCI
Issue Date
201204
Publisher
WILEY-BLACKWELL
Citation
GENETIC EPIDEMIOLOGY, v.36, no.3, pp.263 - 273
Abstract
We study the analysis of a joint association between a genetic marker with both binary (case-control) and quantitative (continuous) traits, where the quantitative trait values are only available for the cases due to data sharing and outcome-dependent sampling. Data sharing becomes common in genetic association studies, and the outcome-dependent sampling is the consequence of data sharing, under which a phenotype of interest is not measured for some subgroup. The trend test (or Pearson's test) and F-test are often, respectively, used to analyze the binary and quantitative traits. Because of the outcome-dependent sampling, the usual F-test can be applied using the subgroup with the observed quantitative traits. We propose a modified F-test by also incorporating the genotype frequencies of the subgroup whose traits are not observed. Further, a combination of this modified F-test and Pearson's test is proposed by Fisher's combination of their P-values as a joint analysis. Because of the correlation of the two analyses, we propose to use a Gamma (scaled chi-squared) distribution to fit the asymptotic null distribution for the joint analysis. The proposed modified F-test and the joint analysis can also be applied to test single trait association (either binary or quantitative trait). Through simulations, we identify the situations under which the proposed tests are more powerful than the existing ones. Application to a real dataset of rheumatoid arthritis is presented. Genet. Epidemiol. 36:263-273, 2012. (C) 2012 Wiley Periodicals, Inc.
URI
http://hdl.handle.net/YU.REPOSITORY/28574http://dx.doi.org/10.1002/gepi.21619
ISSN
0741-0395
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이과대학 > 통계학과 > Articles
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