Before revision: We propose a dynamic hidden-variable model to formally define the two dynamical classes , with which we show that the global fluctuations in a real-world dynamical system can be explained by either of the two simple mechanisms.
After revision: We propose a dynamic hidden-variable model to formally characterize the two dynamical classes , with which we show that the global fluctuations in a real-world dynamical system can be explained by either of the two simple mechanisms.