CVTresh: R Package for Level-Dependent Cross-Validation Thresholding

Donghoh Kim and Hee-Seok Oh

Journal of Statistical Software, 2006, vol. 015, issue i10

Abstract: The core of the wavelet approach to nonparametric regression is thresholding of wavelet coefficients. This paper reviews a cross-validation method for the selection of the thresholding value in wavelet shrinkage of Oh, Kim, and Lee (2006), and introduces the R package CVThresh implementing details of the calculations for the procedures. This procedure is implemented by coupling a conventional cross-validation with a fast imputation method, so that it overcomes a limitation of data length, a power of 2. It can be easily applied to the classical leave-one-out cross-validation and K-fold cross-validation. Since the procedure is computationally fast, a level-dependent cross-validation can be developed for wavelet shrinkage of data with various sparseness according to levels.

Date: 2006-04-08
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Persistent link: https://EconPapers.repec.org/RePEc:jss:jstsof:v:015:i10

DOI: 10.18637/jss.v015.i10

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