Activity Fragmentation Metrics Extracted from Minute Level
Activity Data
c(
person(given = "Junrui", family = "Di",
role = c("aut", "cre"), email = "dijunrui@gmail.com"),
person(given = "John", family = "Muschelli",
role = c("aut"), email = "muschellij2@gmail.com"),
person(given = "Vadim", family = "zipunnikov",
role = c("aut"), email = "vadim.zipunnikov@gmail.com")
)
Recent studies haven shown that, on top of total daily active/sedentary volumes, the time
accumulation strategies provide more sensitive information. This package provides functions to extract
commonly used fragmentation metrics to quantify such time accumulation strategies based on minute level
actigraphy-measured activity counts data.
accelerometry, dplyr, ineq, survival, stats, tidyr
Junrui Di [aut, cre],
John Muschelli [aut],
Vadim zipunnikov [aut]

c(person("Margaret", "Banker", role = c("aut"),
email = "mbanker@umich.edu"),
person("Nathan", "Szeto", role = c("aut"),
email = "nss2@williams.edu"),
person("Jonggyu", "Baek", role = c("aut")),
person("Alice", "Cleynen", role = c("aut")),
person("Guillem", "Rigaill", role = c("aut")),
person("Michel", "Koskas", role = c("aut")),
person("Michael", "Kleinsasser", role = c("cre"),
email = "mkleinsa@umich.edu"))
Estimate sleep duration using a Pruned Dynamic
Programming (PDP) algorithm that quickly and efficiently identifies
changepoints. When applied to physical activity data it can identify
transitions from wakefulness to sleep and vice versa. Baek, Jonggyu, Banker,
Margaret, Jansen, Erica C., She, Xichen, Peterson, Karen E., Pitchford,
E. Andrew, Song, Peter X. K. (2021) "An Efficient Segmentation Algorithm to
Estimate Sleep Duration from Actigraphy Data" <doi:10.1007/s12561-021-09309-3>.
dplyr, stringr, lubridate, accelerometry, DBI, RSQLite,
lazyeval, methods, utils, tibble
Margaret Banker [aut],
Nathan Szeto [aut],
Jonggyu Baek [aut],
Alice Cleynen [aut],
Guillem Rigaill [aut],
Michel Koskas [aut],
Michael Kleinsasser [cre]

William Shannon, Tao Li, Hong Xian, Jia Wang, Elena Deych,
Carlos Gonzalez
This package implements functional linear modeling and
analysis for actigraphy data.