Recurrence period density entropy

Recurrence Period Density Entropy (RPDE) is a concept used in the analysis of dynamical systems, particularly in the study of time series data to assess the complexity and predictability of the underlying processes. It is closely related to concepts from chaos theory and nonlinear dynamics. **Key Concepts:** 1. **Recurrence:** In the context of dynamical systems and time series, a recurrence refers to the phenomenon where a state of the system returns to a previously visited state.