Nothing
The facilities can roughly be grouped as: . 1) Facilities for groupwise computations of summary statistics and other facilities for working with grouped data: 'do' something to data stratified 'by' some variables. . 2) LSmeans (leastsquares means), general linear contrasts. . 3) Miscellaneous other utilities.
Package details 


Author  Sren Hjsgaard <sorenh@math.aau.dk> and Ulrich Halekoh <uhalekoh@health.sdu.dk> 
Date of publication  20160331 17:38:50 
Maintainer  Sren Hjsgaard <sorenh@math.aau.dk> 
License  GPL (>= 2) 
Version  4.515 
URL  http://people.math.aau.dk/~sorenh/software/doBy/ 
Package repository  View on CRAN 
Installation 
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