Contains: 1) Facilities for working with grouped data: 'do' something to data stratified 'by' some variables. 2) LSmeans (least-squares means), general linear contrasts. 3) Miscellaneous other utilities.
Groupwise Statistics, LSmeans, Linear Contrasts, Utilities
Author: Søren Højsgaard, Ulrich Halekoh
CRAN page:
https://cran.r-project.org/web/packages/doBy/index.html
Further info at: