Probability estimation Given an observation sequence and a model compute the probability of the observation sequence O=(01….On),=(A,B,) Compute P(Olu9 Compute ( | ) ( ... ), ( , , ) 1   P O O = o oT = A B P o1 ot-1 ot ot+1 oT Given an observation sequence and a model, compute the probability of the observation sequence Probability Estimation