hidden model in math definition hidden model definition hidden model definition wikipedia hidden model definition hidden model definition when is a hidden variable used what is the hidden markov model hidden markov model definition hidden model definition what is the function of hidden variable in math hidden model of markov model hidden probability definition hidden model definition wikipedia hidden markov model definition what are hidden variables in a markov chain in java? hidden model definition what is the meaning of hidden markov hidden model definition hidden markov model definition hidden model of markov