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- W2567054579 abstract "It is important to study the interaction between two risk factors in molecular epidemiology studies. To improve the power for the detection of interaction, some statistical testing procedures have been proposed in the literature by incorporating certain assumptions on the underlying joint distribution of the two risk factors. For example, the well known case-only test used in genetic epidemiology studies is derived under the assumption of independency between the two considered risk factors. However, those testing procedures could have detrimental effects on both false positive and false negative rates when the assumptions are not met. We propose to use a parametric copula function to model the joint distribution while leaving the marginal distributions for the two risk factors totally unspecified. A unified approach is proposed to estimate/test the interaction effect. This approach is very flexible and can be applied to study the interaction between two risk factors that are continuous or discrete. A simulation study demonstrates that the proposed approach is generally more powerful than the traditional robust test derived under the standard logistic regression without specifying the relationship between the two risk factors. The performance of the proposed approach is comparable with the case-only test when the two risk factors are indeed independent in the control population. Unlike the case-only test, the proposed test can still maintain the correct type I error rate when the independence assumption is not valid. The application of the proposed procedure is demonstrated through two cancer epidemiology studies." @default.
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- W2567054579 date "2013-01-01" @default.
- W2567054579 modified "2023-10-02" @default.
- W2567054579 title "A copula-model based semiparametric interaction test under the casecontrol design" @default.
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- W2567054579 doi "https://doi.org/10.5705/ss.2012.013s" @default.
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