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Table 1 Description of the domains characterizing the features

From: Review and classification of variability analysis techniques with clinical applications

Types of domain

Name

Statistical

Standard statistical features, form factor, some symbolic dynamics features, turns count.

Geometric

Grid counting, heart rate turbulence, Poincaré plots features, recurrence plot features, spatial filling index.

Informational

Approximate entropy, conditional entropy, compression entropy, fuzzy entropy, Kullback-Leibler permutation entropy, multiscale entropy, predictive-based features, sample entropy, Shannon entropy, similarity indexes, Rényi entropy.

Energetic

Frequency features, energy operators, multiscale time irreversibility, time-frequency features.

Invariant

Allan scaling exponent, correlation dimension, detrended fluctuation analysis, diffusion entropy, embedding scaling exponent, Fano scaling exponent, finite growth rates, Higuchi's algorithm, index of variability, Kolmogorov-Sinai entropy, largest Lyapunov exponent, multifractal exponents, power spectrum scaling exponent, probability distribution scaling exponent, rescaled detrended range analysis, scaled windowed variance.