The doBy package for is (yet another) R package with utility
functions.
The name came from "do something on data
which is grouped By some variables".
However, the package now contains many other utilities.
Development versions of the package may be available here
Population means (also called marginal means or
least-squares means or lsmeans)
A recent addition to the package is facilities for calculating
population means (LSMEANS in SAS jargon).
Click here (for online
viewing) and here (for pdf for printing).
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version 3.89. On 22 Feb 2012, 18:24.