Nonparametric regression for interval-valued data based on local linear smoothing approach

In this paper, we propose an interval local linear method (ILLM) to fit the regression model with interval -valued explanatory and response variables. The proposed method has no restriction on the form of the regression function. Moreover, it reduces the boundary effect of interval kernel method. Some experi-mental studies including two simulations and four real datasets are examined to evaluate the proposed method. Experimental results show that our method has higher predictive accuracy than some existed methods, including the center and range method, the interval least absolute method, the interval kernel method, multi-output support vector regression and the interval multilayer perceptron.(c) 2022 Elsevier B.V. All rights reserved.