Data-dependent kn-NN and kernel estimators consistent for arbitrary processes

  • Authors:
  • S. R. Kulkarni;S. E. Posner;S. Sandilya

  • Affiliations:
  • Dept. of Electr. Eng., Princeton Univ., NJ;-;-

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2006

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Abstract

Let X1, X2,... be an arbitrary random process taking values in a totally bounded subset of a separable metric space. Associated with Xi we observe Yi drawn from an unknown conditional distribution F(y|Xi=x) with continuous regression function m(x)=E[Y|X=x]. The problem of interest is to estimate Yn based on Xn and the data {(Xi, Yi)}i=1n-1. We construct appropriate data-dependent nearest neighbor and kernel estimators and show, with a very elementary proof, that these are consistent for every process X1, X2,.