An Effective Scheme for Estimating a Smoother Parameter in the Method of Regularization
Applied and Computational Mathematics
Volume 2, Issue 6, December 2013, Pages: 118-123
Received: Aug. 28, 2013; Published: Oct. 20, 2013
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Hongmei Bao, Graduate School of Environmental Science, Okayama University, Okayama, Japan
Kaoru Fueda, Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
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We had proposed a scheme for the surface approximation which consists of the estimation by the regularization method and the evaluation by generalized CV with an influence function [1]. We have to decide the value of the optimal smoother parameter which can minimize the value of the evaluation function. Among the models which have suitable parameters, we have to choose the best model using information criteria such as CV or generalized CV with an influence function (GCVIF). However, the method of GCVIF is not practical, because it requires the calculation of the inverse matrix of the hat matrix and the influence function [2]. Those calculations take a large amount of time when n increases. An efficient scheme which will take a small amount of time is required. On the other hand, there are many parameters which we have to decide.Those are the coefficients of the spline functions and the total number of knots, and positions of the parameters and a smoother parameter of the penalized term. The range of the total number of knots is decided by the total number of sample points. The range of the positions of the knots is decided by the area of the surface. However, it is difficult to estimate the range of the value of the smoother parameter. Therefore, we have to estimate it quite roughly. In this paper, we propose an effective method to estimate the range of the smoother parameter and consequently obtain the parameter precisely. We can reduce the calculation time which does not contribute to the selection of the optimal model and we can determine a more accurate and smoother parameter in a small amount of time.
Spline Interpolation, Penalized Coefficient, Smoother Parameter, Method of Regularization, Cross-Validation
To cite this article
Hongmei Bao, Kaoru Fueda, An Effective Scheme for Estimating a Smoother Parameter in the Method of Regularization, Applied and Computational Mathematics. Vol. 2, No. 6, 2013, pp. 118-123. doi: 10.11648/j.acm.20130206.11
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