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Universal prediction of individual binary sequences in the presence of noise

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2 Author(s)
Weissman, T. ; Dept. of Electr. Eng., Technion-Israel Inst. of Technol., Haifa, Israel ; Merhav, N.

The problem of predicting the next outcome of an individual binary sequence, based on noisy observations of the past, is considered. The goal of the predictor is to perform, for each individual sequence, “almost” as well as the best in a set of experts, where performance is evaluated using a general loss function. A comprehensive approach to prediction in this noisy setting is presented and proven generally efficient under appropriate conditions. As an illustration of the applicability of the approach suggested for concrete situations, two important special cases are explicitly treated. The first is the case where the data-corrupting noise process is binary-valued (where the observed bit is the bitwise XOR of the clean bit and the noise bit). The second case is that of real-valued additive noise. It is shown that even in this more challenging situation, where the information available to the predictor regarding the past sequence is incomplete, a predictor can be guaranteed to successfully compete with a whole set of experts in considerably strong senses

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Information Theory, IEEE Transactions on  (Volume:47 ,  Issue: 6 )