3.2.5 A Markov chain has the transition probability matrix 0 1 2 0 0.7 0.2 0.1 P= 1 0.3 0.5 0.2 2 0 0 1 The Markov chain starts at time zero in state Xo = 0. Let T= min{n ≥ 0; Xn=2} be the first time that the process reaches state 2. Eventually, the process will reach and be absorbed into state 2. If in some experiment we observed such a

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3.2.5 A Markov chain has the transition probability matrix
0 1 2
0.2
0.1
0.5
0.2
0 1
0 0.7
P= 1 0.3
2
0
The Markov chain starts at time zero in state Xo = 0. Let
T= min{n ≥ 0; Xn = 2}
be the first time that the process reaches state 2. Eventually, the process will
reach and be absorbed into state 2. If in some experiment we observed such a
process and noted that absorption had not yet taken place, we might be interested
in the conditional probability that the process is in state 0 (or 1), given that
absorption had not yet taken place. Determine Pr{X3 = 0|X0, T > 3}.
Hint: The event {T > 3} is exactly the same as the event {X3 ‡ 2} = {X3 =
0} U {X3 = 1}.
Transcribed Image Text:3.2.5 A Markov chain has the transition probability matrix 0 1 2 0.2 0.1 0.5 0.2 0 1 0 0.7 P= 1 0.3 2 0 The Markov chain starts at time zero in state Xo = 0. Let T= min{n ≥ 0; Xn = 2} be the first time that the process reaches state 2. Eventually, the process will reach and be absorbed into state 2. If in some experiment we observed such a process and noted that absorption had not yet taken place, we might be interested in the conditional probability that the process is in state 0 (or 1), given that absorption had not yet taken place. Determine Pr{X3 = 0|X0, T > 3}. Hint: The event {T > 3} is exactly the same as the event {X3 ‡ 2} = {X3 = 0} U {X3 = 1}.
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