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arXiv 0910.3070math.STstat.TH
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具有函数输出的函数线性回归预测的渐近性

Asymptotics of prediction in functional linear regression with functional outputs

Christophe Crambes, André Mas

摘要:

研究了具有函数输出的函数线性模型$Y=SX+ε$的预测问题,其中协变量$X$和$Y$属于某个函数空间,$S$是一个线性算子.我们提供的渐近均方预测误差与精确常数为我们的估计,这是基于功能PCA的输入,并具有经典的形式。作为结果,我们得到的投影空间的维数$k_{n}$的最佳选择。我们得到的速率是最优的极大极小意义下,推广那些发现时,输出是真实的。我们的主要结果持有没有事先假设的衰减率的输入的特征值。这允许考虑可以是非常不规则的或非常平滑的宽类别的参数和输入$X(\cdot) $。我们还证明了预测器的中心极限定理,改进了Cardot,Mas和Sarda(2007)在具有标量输出的简单模型中的结果。我们证明,由于基本的反问题,裸估计不能收敛于函数空间的范数分布

英文摘要:

We study prediction in the functional linear model with functional outputs : $Y=SX+ε$ where the covariates $X$ and $Y$ belong to some functional space and $S$ is a linear operator. We provide the asymptotic mean square prediction error with exact constants for our estimator which is based on functional PCA of the input and has a classical form. As a consequence we derive the optimal choice of the dimension $k_{n}$ of the projection space. The rates we obtain are optimal in minimax sense and generalize those found when the output is real. Our main results hold with no prior assumptions on the rate of decay of the eigenvalues of the input. This allows to consider a wide class of parameters and inputs $X(\cdot) $ that may be either very irregular or very smooth. We also prove a central limit theorem for the predictor which improves results by Cardot, Mas and Sarda (2007) in the simpler model with scalar outputs. We show that, due to the underlying inverse problem, the bare estimate cannot converge in distribution for the norm of the function space

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