g.IVIS {GGIR} | R Documentation |
Calculates IV and IS
Description
To extract interdaily stability and interdaily variability as originally proposed by van Someren.
Usage
g.IVIS(Xi, epochSize = 60, threshold = NULL)
Arguments
Xi |
Vector with acceleration values, e.g. ENMO metric. |
epochSize |
Epoch size of the values in Xi expressed in seconds. |
threshold |
Acceleration threshold to distinguish inactive from active |
Value
InterdailyStability |
|
IntradailyVariability |
Author(s)
Ian Meneghel Danilevicz <ian.meneghel-danilevicz@inserm.fr> Vincent T van Hees <v.vanhees@accelting.com>
References
Eus J. W. Van Someren, Dick F. Swaab, Christopher C. Colenda, Wayne Cohen, W. Vaughn McCall & Peter B. Rosenquist. Bright Light Therapy: Improved Sensitivity to Its Effects on Rest-Activity Rhythms in Alzheimer Patients by Application of Nonparametric Methods Chronobiology International. 1999. Volume 16, issue 4.
Examples
Xi = abs(rnorm(n = 10000,mean = 0.2))
IVISvariables = g.IVIS(Xi=Xi)
[Package GGIR version 3.2-6 Index]