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- W2000938784 abstract "An orthogonal series estimator of the conditional density of a response given a vector of continuous and ordinal/nominal categorical predictors is suggested. The estimator is based on writing a conditional density as a sum of orthogonal projections on all possible subspaces of reduced dimensionality and then estimating each projection via a shrinkage procedure. The shrinkage procedure uses a universal thresholding and a dyadic-blockwise shrinkage for low and high frequencies, respectively. The estimator is data-driven, is adaptive to underlying smoothness of a conditional density, and attains a minimax rate of the mean integrated squared error convergence. Furthermore, if a conditional density depends only on a subgroup of predictors, then the estimator seizes the opportunity and attains a corresponding minimax rate of convergence. The latter property relaxes the notorious “curse of dimensionality.” Moreover, the estimator is fast, because neither projections nor shrinkages are computation-intensive. A numerical study for finite samples and a real example are presented. Our results indicate that the proposed estimation procedure is practical and has a rigorous theoretical justification." @default.
- W2000938784 created "2016-06-24" @default.
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- W2000938784 date "2010-06-01" @default.
- W2000938784 modified "2023-09-25" @default.
- W2000938784 title "Dimension Reduction and Adaptation in Conditional Density Estimation" @default.
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- W2000938784 doi "https://doi.org/10.1198/jasa.2010.tm09426" @default.
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