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About: Correlation integral     Goto   Sponge   NotDistinct   Permalink

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In chaos theory, the correlation integral is the mean probability that the states at two different times are close: where is the number of considered states , is a threshold distance, a norm (e.g. Euclidean norm) and the Heaviside step function. If only a time series is available, the phase space can be reconstructed by using a time delay embedding (see Takens' theorem): where is the time series, the embedding dimension and the time delay. The correlation integral is used to estimate the correlation dimension. An estimator of the correlation integral is the correlation sum: