ExtCos: Extended Cosinor Model for Circadian Rhythmicity

In junruidi/actigraphy: Feature Extraction from Minute Level Actigraphy Data

Description

A parametric approach to study circadian rhythmicity assuming cosinor shape. Here we used the anti logistic transformed cosine curves, which provided 5 parameters.

Usage

ExtCos(x, logtransform = TRUE)

Arguments

x	vector vector of dimension n*1440 which reprsents n days of 1440 minute activity data
logtransform	Conduct log transfomation before. Default is TRUE.

Value

A list with elements

min	minimum
amp	amplitude
alpha	alpha parameter:determines whether the peaks of the curve are wider than the troughs
beta	beta parameter: determines whether the function rises and falls more steeply than the cosine curve
acro	acrophase
F_imp	pseudo-F statistics

Examples

count.days = rpois(1440*5, lambda = 5)
extcos = ExtCos(x = count.days, logtransform  = TRUE)

junruidi/actigraphy documentation built on Sept. 25, 2019, 7:48 a.m.