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arXiv 2201.10063stat.ME
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基于自适应样条拟合的变系数模型

Varying Coefficient Model via Adaptive Spline Fitting

Xufei Wang, Bo Jiang, Jun S. Liu

摘要:

变系数模型作为非参数化建模的一种强有力的降维工具,受到了研究者的广泛关注。现有的多项式样条拟合的变系数模型大都假设节点等距,并以节点个数为超参数。然而,施加等距结似乎过于僵化,并且系统地确定结的最佳数量也是一个挑战。在这篇文章中,我们处理这个挑战,利用多项式样条自适应选择和预测特定的节点,以适应系数变化的模型中的系数。提出了一种有效的动态规划算法来寻找最优解。数值结果表明,与等距样条拟合方法相比,新方法可以获得显着更小的系数均方误差。

英文摘要:

The varying coefficient model has received broad attention from researchers as it is a powerful dimension reduction tool for non-parametric modeling. Most existing varying coefficient models fitted with polynomial spline assume equidistant knots and take the number of knots as the hyperparameter. However, imposing equidistant knots appears to be too rigid, and determining the optimal number of knots systematically is also a challenge. In this article, we deal with this challenge by utilizing polynomial splines with adaptively selected and predictor-specific knots to fit the coefficients in varying coefficient models. An efficient dynamic programming algorithm is proposed to find the optimal solution. Numerical results show that the new method can achieve significantly smaller mean squared errors for coefficients compared with the equidistant spline fitting method.

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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