trev_num {tsfeatures}

Normalized nonlinear autocorrelation, the numerator of the trev function of a time series from software package hctsa

Description

Calculates the numerator of the trev function, a normalized nonlinear autocorrelation, The time lag is set to 1.

Usage

trev_num(y)

Arguments

y

the input time series

Value

the numerator of the trev function of a time series

Author(s)

Yangzhuoran Yang

References

B.D. Fulcher and N.S. Jones. hctsa: A computational framework for automated time-series phenotyping using massive feature extraction. Cell Systems 5, 527 (2017).

B.D. Fulcher, M.A. Little, N.S. Jones Highly comparative time-series analysis: the empirical structure of time series and their methods. J. Roy. Soc. Interface 10, 83 (2013).

Examples

trev_num(WWWusage)