In this paper, using the notion of a binary Channel Matrix as well known in Information Theory, we present an equivalent relation between the SPRT (Sequential Probability Ratio Test) and Bayes' Updating. Moreover, we show the relationship between the SPRT and NSPR (New Sequential Probability Ratio) where a Hidden Markov Model with Poisson process is introduced as structural change model. And we also provide the change point detection performance of SPRT and NSPR by experimental results.
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