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longpower  

Sample Size Calculations for Longitudinal Data
View on CRAN: Click here


Download and install longpower package within the R console
Install from CRAN:
install.packages("longpower")

Install from Github:
library("remotes")
install_github("cran/longpower")

Install by package version:
library("remotes")
install_version("longpower", "1.0.27")



Attach the package and use:
library("longpower")
Maintained by
Michael C. Donohue
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2010-09-01
Latest Update: 2024-09-05
Description:
Compute power and sample size for linear models of longitudinal data. Supported models include mixed-effects models and models fit by generalized least squares and generalized estimating equations. The package is described in Iddi and Donohue (2022) . Relevant formulas are derived by Liu and Liang (1997) , Diggle et al (2002) , and Lu, Luo, and Chen (2008) .
How to cite:
Michael C. Donohue (2010). longpower: Sample Size Calculations for Longitudinal Data. R package version 1.0.27, https://cran.r-project.org/web/packages/longpower. Accessed 05 Aug. 2026.
Previous versions and publish date:
(2026-07-09 07:53), 1.0-1 (2010-09-01 22:05), 1.0-2 (2012-05-31 19:32), 1.0-3 (2013-01-11 22:38), 1.0-4 (2013-01-23 06:58), 1.0-7 (2013-05-22 20:08), 1.0-8 (2013-05-28 22:39), 1.0-9 (2013-06-17 18:18), 1.0-10 (2013-09-21 10:00), 1.0-11 (2015-01-16 06:42), 1.0-15 (2016-05-18 01:31), 1.0-16.1 (2018-09-11 11:37), 1.0-16 (2016-07-25 20:36), 1.0-19 (2019-03-07 18:10), 1.0-21 (2020-04-22 00:00), 1.0.23 (2021-04-20 07:40), 1.0.24 (2023-01-11 11:20), 1.0.25 (2024-01-24 05:40), 1.0.26 (2024-08-27 06:40)
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