#stochastic_process  a statistical process involving a number of random variables depending on a variable parameter (which is usually time)
  supertype:  theoretical_account__theoreticalaccount__model__framework  a simplified description of a complex entity or process; "the computer program was based on a model of the circulatory and respiratory systems"
  subtype:  Markov_process__Markoff_process  a simple stochastic process in which the distribution of future states depends only on the present state and not on how it arrived in the present state
     subtype:  Markov_chain__Markoff_chain  a Markov process for which the parameter is discrete time values
  subtype:  stationary_stochastic_process  a stochastic process in which the distribution of the random variables is the same for any value of the variable parameter

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