Suppose that the monthly log returns, in percentages, of a stock follow the following Markov switching model:
where the transition probabilities are
Suppose that a100 = 6.0, = 50.0, and s100 = 2 with probability 1.0. What is the 1-step ahead volatility forecast at the forecast origin t = 100? Also, if the probability of s100 = 2 is reduced to 0.8, what is the 1-step ahead volatility forecast at the forecast origin t = 100?