A stochastic process is neither deterministic (the next event can be calculated with certainty) nor random (the next event is totally free). It is governed by a set of probabilities. Each event has a probability that depends on the state of the system and perhaps also on its previous history. If for event we substitute symbol, then a natural written language like English or Chinese is a stochastic process.
A message, as Shannon saw, can behave like a dynamical system whose future course is conditioned by its past history.
Information, Gleick
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