Comparative study of approximate entropy and sample entropy robustness to spikes
Artificial Intelligence in Medicine
Fast computation of sample entropy and approximate entropy in biomedicine
Computer Methods and Programs in Biomedicine
An algorithm for on-line detection of high frequency oscillations related to epilepsy
Computer Methods and Programs in Biomedicine
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The approximate entropy (ApEn) is a measure of systems complexity. The implementation of the method is computationally expensive and requires execution time analogous to the square of the size of the input signal. We propose here a fast algorithm which speeds up the computation of approximate entropy by detecting early some vectors that are not similar and by excluding them from the similarity test. Experimental analysis with various biomedical signals revealed a significant improvement in execution times.