Stochastic models and probable frequencies
We can estimate only the behaviour of stochastic systems. Most importantly, these estimations are based on previous behaviours and on the observation of the frequency and amplitude of changes in such behaviours. The oldest example of observing a system and drawing conclusions following such a stochastic model is weather forecast. When discussing the signals acting on processes we will show important phenomena such as noises and disturbances which must be taken into account when building and operating systems.