course |
course_year |
question_number |
tags |
title |
year |
Markov Chains |
IB |
77 |
|
3.I.9D |
2005 |
Prove that if two states of a Markov chain communicate then they have the same period.
Consider a Markov chain with state space ${1,2, \ldots, 7}$ and transition probabilities determined by the matrix
$$\left(\begin{array}{ccccccc}
0 & \frac{1}{4} & \frac{1}{4} & 0 & 0 & \frac{1}{4} & \frac{1}{4} \\
0 & 0 & 0 & 0 & 0 & 0 & 1 \\
0 & 0 & 0 & \frac{1}{3} & 0 & \frac{1}{3} & \frac{1}{3} \\
\frac{1}{2} & 0 & 0 & 0 & 0 & \frac{1}{2} & 0 \\
\frac{1}{6} & \frac{1}{6} & \frac{1}{6} & \frac{1}{6} & 0 & \frac{1}{6} & \frac{1}{6} \\
0 & 0 & 0 & 0 & 0 & 1 & 0 \\
0 & 1 & 0 & 0 & 0 & 0 & 0
\end{array}\right)$$
Identify the communicating classes of the chain and for each class state whether it is open or closed and determine its period.