Pincus, S. () Approximate Entropy (ApEn) as a Complexity Measure. Chaos, 5, APPROXIMATE ENTROPY: A COMPLEXITY MEASURE FOR. BIOLOGICAL family of statistics, ApEn, that can classify complex systems, given at least I In statistics, an approximate entropy (ApEn) is a technique used to quantify the amount of Regularity was originally measured by exact regularity statistics, which has mainly “Approximate entropy as a measure of system complexity”.

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Updated Thursday, 9 July at We may now define. Intuitively, one may reason that the presence of repetitive patterns of fluctuation in a time series renders it more predictable than a time series in which such patterns are absent.

This paper has highly influenced 51 other papers.

Approximate Entropy (ApEn)

By the same reasoning, is similar to,Views Read Edit View history. By clicking accept or continuing to use the site, you agree to the terms outlined in our Privacy PolicyTerms of Serviceand Dataset License. Moment statisticssuch as mean and variancewill not distinguish between these two series.

CameronTrevor S.

Approximate Entropy (ApEn)

While a concern for artificially constructed examples, it is usually not a concern in practice. Series 2 is randomly valued; knowing one term has the value of 20 gives no insight into what value the next term will have.


This page was xpen edited on 6 Septemberat The results using compound measures of behavioural patterns of fifteen healthy individuals are presented. ApEn has been applied to classify EEG in psychiatric diseases, such as schizophrenia, [8] epilepsy, [9] and addiction. Does Entropy Really Measure Disorder? The quantity expresses measire prevalence of repetitive patterns of length in.

Showing of extracted citations. On the estimation of brain signal entropy from sparse neuroimaging data. Artificial Intelligence in Medicine.

Approximate entropy (ApEn) as a complexity measure. – Semantic Scholar

Entropy, Complexity and Stability. The algorithm for a;proximate has been published elsewhere []. Yet series 1 is “perfectly regular”; knowing one term has the value of 20 enables one to predict with certainty that the next term will have the value of This description is provided here so that researchers who wish to use ApEn can write their own code for doing so.

Since the total number of is.

Approximate entropy (ApEn) as a complexity measure.

For an excellent review of the shortcomings of and the strengths of alternative statistics, see reference [5]. Hence is either ordepending onand the mean value of all 46 of the is: Doing so, we obtain: Heart and Circulatory Physiology.


Let’s choose this choice simplifies the calculations for this example, but similar results would be obtained for other nearby values of and again, the value of can be varied somewhat without affecting the result. PuthankattilPaul K.

Citations Publications citing this paper. Tapia CortezJames W.

We can now repeat the above steps to determine how many of the are similar to, etc. We can calculate for each pattern inand we define as the mean of these values. Complexitty application of the compound measures is shown to correlate with complexity analysis. These measures provide clinically applicable complexity analysis of behavioural patterns yielding scalar characterisation of time-varying behaviours registered over an extended period of time.

SokunbiGeorge G.

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