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Reference.org
Recurrence period density entropy
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<p>Recurrence period density entropy (RPDE) is a method, in the fields of <a href="/facts/Dynamical_systems/782gREl5">dynamical systems</a>, <a href="/facts/Stochastic_processes/Ng1n1dnB">stochastic processes</a>, and <a href="/facts/Time_series_analysis/fSXPR817">time series analysis</a>, for determining the periodicity, or repetitiveness of a signal. </p>