ABI: Activity balance index (ABI)
In GGIR: Raw Accelerometer Data Analysis

View source: R/ABI.R

ABI	R Documentation

Activity balance index (ABI)

Description

This function estimates the Activity balance index (ABI), which is a transformation of the self-similarity parameter (SSP), also known as scaling exponent or alpha.

Usage

  ABI(x)

Arguments

`x`	the estimated self-similarity parameter (SSP)

Details

ABI = exp(-abs(SSP-1)/exp(-2))

Value

The estimated Activity balance index (ABI) is a real number between zero and one.

Author(s)

Ian Meneghel Danilevicz <ian.meneghel-danilevicz@inserm.fr>

References

C.-K. Peng, S.V. Buldyrev, S. Havlin, M. Simons, H.E. Stanley, A.L. Goldberger Phys. Rev. E, 49 (1994), p. 1685 Mesquita, Victor & Filho, Florencio & Rodrigues, Paulo. (2020). Detection of crossover points in detrended fluctuation analysis: An application to EEG signals of patients with epilepsy. Bioinformatics. 10.1093/bioinformatics/btaa955.

Examples

  # Estimate Activity balance index of a very known time series
  # available on R base: the sunspot.year.
  ## Not run:   
    ssp = SSP(sunspot.year)
    abi = ABI(ssp)
  
## End(Not run)

GGIR documentation built on April 3, 2025, 6 p.m.