interdaily_stability: Interdaily stability (IS)

In steffenhartmeyer/lightdosimetry: Functions for quantifying personal light exposure data

Interdaily stability (IS)

Description

This function calculates the variability of 24h light exposure patterns across multiple days. Calculated as the ratio of the variance of the average daily pattern to the total variance across all days. Calculated for mean hourly light levels. Ranges between 0 (Gaussian noise) and 1 (Perfect Stability).

Usage

interdaily_stability(lightVar, datetimeVar, as_df = TRUE)

Arguments

lightVar	Numeric vector containing the light data.
datetimeVar	Vector containing the datetime data. Must be POSIXct.
as_df	Logical. Should the output be returned as a data frame? Defaults to TRUE.

Value

Single column data frame or vector.

References

Van Someren, E. J. W., Swaab, D. F., Colenda, C. C., Cohen, W., McCall, W. V., & Rosenquist, P. B. (1999). Bright Light Therapy: Improved Sensitivity to Its Effects on Rest-Activity Rhythms in Alzheimer Patients by Application of Nonparametric Methods. Chronobiology International, 16(4), 505–518. https://doi.org/10.3109/07420529908998724

steffenhartmeyer/lightdosimetry documentation built on Jan. 29, 2024, 12:48 p.m.