----- Errata for the initial version (not the latest version on 18 Jan) ----

Slide 10: ergodic model is missing arrows between two of the states (not corrected in the latest version)

Slide 14: P(x|q_2) should be P(x_2|q_2).  P(x|q_t) should be P(x_t|q_t)

      	  "join likelihood" corrected to "joint likelihood"

	  p(q_t) was described as the initial occupation probabality of each
	  state.  It should be p(q_1)