Convergence rates for pointwise curve estimation with a degenerate design

Details Convergence rates for pointwise curve estimation with a degenerate design Convergence rates for pointwise curve estimation with a degenerate design

2004-10-15

arxiv.org/abs/math/0410354v3

Mathematics

Statistics Theory

Scientific paper

The nonparametric regression with a random design model is considered. We want to recover the regression function at a point x where the design density is vanishing or exploding. Depending on assumptions on the regression function local regularity and on the design local behaviour, we find several minimax rates. These rates lie in a wide range, from slow l(n) rates where l(.) is slowly varying (for instance (log n)^(-1)) to fast n^(-1/2) * l(n) rates. If the continuity modulus of the regression function at x can be bounded from above by a s-regularly varying function, and if the design density is b-regularly varying, we prove that the minimax convergence rate at x is n^(-s/(1+2s+b)) * l(n).

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