Read e-book online Hidden Markov Processes: Theory and Applications to Biology PDF

By M. Vidyasagar

ISBN-10: 1400850517

ISBN-13: 9781400850518

This ebook explores vital facets of Markov and hidden Markov tactics and the purposes of those principles to varied difficulties in computational biology. The ebook starts off from first ideas, in order that no prior wisdom of chance is critical. although, the paintings is rigorous and mathematical, making it necessary to engineers and mathematicians, even these no longer drawn to organic purposes. a variety of workouts is equipped, together with drills to familiarize the reader with techniques and extra complicated difficulties that require deep pondering the speculation. organic purposes are taken from post-genomic biology, particularly genomics and proteomics.

The themes tested contain usual fabric resembling the Perron-Frobenius theorem, temporary and recurrent states, hitting possibilities and hitting instances, greatest probability estimation, the Viterbi set of rules, and the Baum-Welch set of rules. The e-book comprises discussions of tremendous priceless subject matters now not frequently obvious on the simple point, akin to ergodicity of Markov procedures, Markov Chain Monte Carlo (MCMC), details thought, and big deviation thought for either i.i.d and Markov techniques. The ebook additionally provides state of the art awareness conception for hidden Markov versions. between organic purposes, it deals an in-depth examine the BLAST (Basic neighborhood Alignment seek approach) set of rules, together with a complete rationalization of the underlying thought. different purposes corresponding to profile hidden Markov versions also are explored.

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Additional info for Hidden Markov Processes: Theory and Applications to Biology

Example text

Un } where ui 2 M for all i. Then M⇤ is countable. But uncountably infinite sets are also relevant, such as with real-valued random variables. A less familiar example is that, if M is a finite set, then the set of all sequences (not just finite sequences) taking values in M is an uncountably infinite set. It turns out that the method adopted thus far to define probabilities over finite sets, namely just to assign nonnegative “weights” to each element in such a way that the weights add up to one, works perfectly well on countable sets.

2 The above observation motivates the notion of the correlation coefficient between two real-valued random variables. 13 Suppose X, Y are real-valued random variables assuming values in finite sets A, B ✓ R respectively. Let denote their joint distribution, and X , Y the two marginal distributions. Let E[XY, ], E[X, X ], E[Y, Y ] denote expectations, and let (X), (Y ) denote the standard deviations of X, Y under their respective marginal distributions. 21) is called the correlation coefficient between X and Y .

Proof. The first part of the lemma says that if the original function h assumes only nonnegative values, then so does its conditional expectation h|X. 33). The second part follows readily upon observing that if h : A ⇥ B ! [↵, ], then both h ↵ and h are nonnegative-valued functions. 2 A very useful property of the conditional expectation is given next. 20 Suppose X, Y are random variables assuming values in finite sets A = {a1 , . . , an }, B = {b1 , . . , bm } respectively. Let 2 Snm denote their joint distribution.

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Hidden Markov Processes: Theory and Applications to Biology by M. Vidyasagar

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