Detect sustained inactivity bouts (SIBs) — acti_sleep

For raw triaxial accelerometer data, the default "vanHees2015" method derives a longitudinal-axis angle at epoch resolution and identifies periods with no posture change above angle_threshold. For epoch-level data, provide a precomputed sib column; alternatively, "low_activity" marks epochs whose conventional activity metric is at or below activity_threshold.

Usage

acti_sleep_sib(
  data,
  method = c("vanHees2015", "low_activity"),
  epoch = "5 seconds",
  time_threshold_minutes = 5,
  angle_threshold = 5,
  activity_threshold = 0
)

Arguments

data: Raw triaxial or regular epoch-level data.
method: SIB method: "vanHees2015" or "low_activity".
epoch: Raw-data aggregation epoch.
time_threshold_minutes, angle_threshold: van Hees posture-change parameters.
activity_threshold: Low-activity cutoff for epoch data.

Value

A tibble with time, sib, and supporting epoch-level variables.

Examples

# \donttest{
raw <- actiread::acti_read_gt3x(actiread::acti_example_gt3x(), verbose = FALSE)
sib <- acti_sleep_sib(raw)
# }