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Universal linear least squares prediction: upper and lower bounds

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3 Author(s)
Singer, A.C. ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA ; Kozat, S.S. ; Feder, M.

We consider the problem of sequential linear prediction of real-valued sequences under the square-error loss function. For this problem, a prediction algorithm has been demonstrated whose accumulated squared prediction error, for every bounded sequence, is asymptotically as small as the best fixed linear predictor for that sequence, taken from the class of all linear predictors of a given order p. The redundancy, or excess prediction error above that of the best predictor for that sequence, is upper-bounded by A2P ln(n)/n, where n is the data length and the sequence is assumed to be bounded by some A. We provide an alternative proof of this result by connecting it with universal probability assignment. We then show that this predictor is optimal in a min-max sense, by deriving a corresponding lower bound, such that no sequential predictor can ever do better than a redundancy of A2p ln(n)/n.

Published in:

Information Theory, IEEE Transactions on  (Volume:48 ,  Issue: 8 )

Date of Publication:

Aug 2002

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