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Resistant Smoothing Using the Fast Fourier Transform

Resistant Smoothing Using the Fast Fourier Transform Algorithm AS 222 By W. Hardlat Institut fiir Wirtschaftstheorie JJ. West Germany [Received March 1985. Final revision July 1986] Keywords: Kernel regression estimation; resistant smoothing; Fast Fourier Transform; Language Fortran 66 Description and Purpose Suppose {(Xj' lj)}j= 1 are two-dimensional data points and it is desired to compute the regression curve r(x) = E(YI X = x) of Y on X. The following curve estimator with kernel function K and bandwidth h (1) has been introduced by Nadaraya (1964) and Watson (1964). Brillinger (1977) pointed out the non-resistance to outliers and proposed an M-type smoother. Resistant regression estimates are desirable in data analysis as was pointed out by Velleman and Hoaglin (1981). An application of a resistant smoother to a chemical problem is described in Bussian and Hardle (1984). In this paper we present an algorithm for the one-step M-type smoother 1 1 1 n- h - L K(h- (x - Xj»y,(res j) rn(x) = r:(x) + ---",-j=-n=--1-------­ (2) 1 1 1 n- h - L K(h- (x - X » y,'(res ) j j j= 1 where resj = lj - r:(X and y,(u) = max{ -e, min{u, en, e > 0 is Huber's (1981) well known j) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Royal Statistical Society Series C (Applied Statistics) Oxford University Press

Resistant Smoothing Using the Fast Fourier Transform

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References (13)

Publisher
Oxford University Press
Copyright
© Royal Statistical Society
ISSN
0035-9254
eISSN
1467-9876
DOI
10.2307/2347850
Publisher site
See Article on Publisher Site

Abstract

Algorithm AS 222 By W. Hardlat Institut fiir Wirtschaftstheorie JJ. West Germany [Received March 1985. Final revision July 1986] Keywords: Kernel regression estimation; resistant smoothing; Fast Fourier Transform; Language Fortran 66 Description and Purpose Suppose {(Xj' lj)}j= 1 are two-dimensional data points and it is desired to compute the regression curve r(x) = E(YI X = x) of Y on X. The following curve estimator with kernel function K and bandwidth h (1) has been introduced by Nadaraya (1964) and Watson (1964). Brillinger (1977) pointed out the non-resistance to outliers and proposed an M-type smoother. Resistant regression estimates are desirable in data analysis as was pointed out by Velleman and Hoaglin (1981). An application of a resistant smoother to a chemical problem is described in Bussian and Hardle (1984). In this paper we present an algorithm for the one-step M-type smoother 1 1 1 n- h - L K(h- (x - Xj»y,(res j) rn(x) = r:(x) + ---",-j=-n=--1-------­ (2) 1 1 1 n- h - L K(h- (x - X » y,'(res ) j j j= 1 where resj = lj - r:(X and y,(u) = max{ -e, min{u, en, e > 0 is Huber's (1981) well known j)

Journal

Journal of the Royal Statistical Society Series C (Applied Statistics)Oxford University Press

Published: Mar 1, 1987

Keywords: ; ;

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