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arXiv 1312.0652stat.ME
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基于小波的函数标量有限混合回归模型

Wavelet-Based Scalar-on-Function Finite Mixture Regression Models

Adam Ciarleglio, R. Todd Ogden

摘要:

经典有限混合回归可用于模拟标量预测因子和标量响应之间的关系,标量响应来自由这些预测因子和响应之间的不同关联定义的亚群。在这里,我们扩展了经典的有限混合回归模型,采用基于小波的方法,我们表示的功能预测和组件特定的系数函数在一个适当的小波基方面的功能预测。在模型的小波表示中,对应于函数协变量的系数成为预测因子。在这种情况下,我们通常有更多的预测比观察。因此,我们使用套索型惩罚来执行变量选择和估计。我们还考虑了我们的基于小波的模型的自适应版本。我们讨论了规格的模型,提供了一个拟合算法,并应用和评估我们的方法,使用模拟和一个真实的数据集,从认知能力和扩散张量成像措施之间的关系的研究与多发性硬化症的主题。

英文摘要:

Classical finite mixture regression is useful for modeling the relationship between scalar predictors and scalar responses arising from subpopulations defined by the differing associations between those predictors and responses. Here we extend the classical finite mixture regression model to incorporate functional predictors by taking a wavelet-based approach in which we represent both the functional predictors and the component-specific coefficient functions in terms of an appropriate wavelet basis. In the wavelet representation of the model, the coefficients corresponding to the functional covariates become the predictors. In this setting, we typically have many more predictors than observations. Hence we use a lasso-type penalization to perform variable selection and estimation. We also consider an adaptive version of our wavelet-based model. We discuss the specification of the model, provide a fitting algorithm, and apply and evaluate our method using both simulations and a real data set from a study of the relationship between cognitive ability and diffusion tensor imaging measures in subjects with multiple sclerosis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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