Selection of functional predictors and smooth coefficient estimation for scalar-on-function regression models
标量对函数回归中的函数型预测变量选择与平滑系数估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以 GDP 增长预测作为真实数据应用,因此宏观预测是直接相关的领域;函数回归本身属于通用方法。
标量对函数回归中的函数型预测变量选择与平滑系数估计AI 解读 ↓
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In the framework of scalar-on-function regression models, in which several functional variables are employed to predict a scalar response, we propose a methodology for selecting relevant functional predictors while simultaneously providing accurate smooth (or, more generally, regular) estimates of the functional coefficients. We suppose that the functional predictors belong to a real separable Hilbert space, while the functional coefficients belong to a specific subspace of this Hilbert space. Such a subspace can be a Reproducing Kernel Hilbert Space (RKHS) to ensure the desired regularity characteristics, such as smoothness or periodicity, for the coefficient estimates. Our procedure, called SOFIA (Scalar-On-Function Integrated Adaptive Lasso), is based on an adaptive penalized least squares algorithm that leverages functional subgradients to efficiently solve the minimization problem. We demonstrate that the proposed method satisfies the functional oracle property, even when the number of predictors exceeds the sample size. SOFIA's effectiveness in variable selection and coefficient estimation is evaluated through extensive simulation studies and a real-data application to GDP growth prediction.
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