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# HW2MC - Math331 Fall 2008 Instructor David Anderson 2nd...

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Unformatted text preview: Math331, Fall 2008 Instructor: David Anderson 2nd Markov Chain Homework 1. Consider a Markov chain transition matrix P =   1 / 2 1 / 3 1 / 6 3 / 4 1 / 4 1   . (a) Show the this is a regular Markov chain. (b) If the process is started in state 1, find the probability that it is in state 3 after two steps. (c) Find the limiting probability vector w . (d) Find lim n →∞ p n ( x, y ) for all x, y ∈ S . Why do you know these limits exist? Solution: (a) We have that P 3 =     1 / 2 1 / 3 1 / 6 9 16 1 / 4 3 / 16 3 / 8 1 / 2 1 / 8     and so the Markov chain is regular. (b) We have P 2 =     1 / 2 1 / 3 1 / 6 3 / 8 1 / 2 1 / 8 3 / 4 1 / 4     . Thus P ( X 2 = 3 | X = 1) = P 2 (1 , 3) = 1 / 6. (c) We have to solve the system of equations xP = x = ⇒ [ x 1 , x 2 , x 3 ]   1 / 2 1 / 3 1 / 6 3 / 4 1 / 4 1   = [ x 1 , x 2 , x 3 ] ....
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HW2MC - Math331 Fall 2008 Instructor David Anderson 2nd...

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