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What does the term “hidden” refer to in hidden Markov model technique?

What does the term “hidden” refer to in hidden Markov model technique? Correct Answer Sate sequence

In a hidden Markov model, the state is not directly available to the observer. The output, dependant on the state, is available. The parameters of the model are not hidden, and the model is referred to as hidden Markov model even when the parameters are explicitly available.

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