Tight conditions for consistent variable selection in high dimensional nonparametric regression

Details Tight conditions for consistent variable selection in high dimensional nonparametric regression Tight conditions for consistent variable selection in high dimensional nonparametric regression

2011-02-17

arxiv.org/abs/1102.3616v1

Mathematics

Statistics Theory

Scientific paper

We address the issue of variable selection in the regression model with very high ambient dimension, i.e., when the number of covariates is very large. The main focus is on the situation where the number of relevant covariates, called intrinsic dimension, is much smaller than the ambient dimension. Without assuming any parametric form of the underlying regression function, we get tight conditions making it possible to consistently estimate the set of relevant variables. These conditions relate the intrinsic dimension to the ambient dimension and to the sample size. The procedure that is provably consistent under these tight conditions is simple and is based on comparing the empirical Fourier coefficients with an appropriately chosen threshold value.

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