nparACT_base: Compute classic non-parametric actigraphy measures
In nparACT: Non-Parametric Measures of Actigraphy Data

nparACT_base

R Documentation

Compute classic non-parametric actigraphy measures

Description

Computes the classic non-parametric actigraphy measures interdaily stability (IS), intradaily variability (IV), relative amplitude (RA), as well as the L5 and M10 values and their respective start times, for a single actigraphy file.

Usage

nparACT_base(name, SR, cutoff = 1, plot = T, fulldays = T)

Arguments

`name`	Character string giving the name of the object in the workspace that contains the actigraphy data.
`SR`	Numeric. Sampling rate in Hertz (samples per second).
`cutoff`	Numeric. Activity threshold used to classify movement. Defaults to 1.
`plot`	Logical. If `TRUE`, diagnostic plots of the hourly and minute-wise activity profiles are generated. Defaults to `TRUE`.
`fulldays`	Logical. If `TRUE`, data are truncated to include only complete 24-hour periods. Defaults to `TRUE`.

Details

The function expects the actigraphy data to be available in the workspace under the name provided via name. Data are internally pre-processed, optionally restricted to complete 24-hour periods, and analysed using standard non-parametric actigraphy algorithms.

The input data may contain either two columns (time, activity) or three columns (date, time, activity). Time variables are internally converted to POSIXct. Missing values in the activity signal are not permitted.

The computation of IS and IV is based on hourly averaged activity data. Relative amplitude (RA) is derived from the difference between the most active 10-hour period (M10) and the least active 5-hour period (L5).