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Abstract:
Using wavelet methods, Fan and Koo study optimal estimations for a density with some additive noises over a Besov ball B-r,q(s) (L) (r,q >= 1) and over L-2 risk (Fan and Koo, 2002 [13]). The L-infinity risk estimations are investigated by Lounici and Nickl (2011) [19]. This paper deals with optimal estimations over L-P (1 <= p <= infinity) risk for moderately ill-posed noises. A lower bound of L-P risk is firstly provided, which generalizes Fan Koo and Lounici-Nickl's theorems; then we define a linear and non-linear wavelet estimators, motivated by Fan Koo and Pensky-Vidakovic's work. The linear one is rate optimal for r >= p, and the non-linear estimator attains suboptimal (optimal up to a logarithmic factor). These results can be considered as an extension of some theorems of Donoho et al. (1996) [10]. In addition, our non-linear wavelet estimator is adaptive to the indices s, r, q and L. (C) 2013 Elsevier Inc. All rights reserved.
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Source :
APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS
ISSN: 1063-5203
Year: 2014
Issue: 3
Volume: 36
Page: 416-433
2 . 5 0 0
JCR@2022
ESI Discipline: MATHEMATICS;
ESI HC Threshold:81
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 31
SCOPUS Cited Count: 34
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 8
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