[R] Contrasts in lm

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Dec 6 10:19:39 CET 2001

On Thu, 6 Dec 2001, [iso-8859-1] Søren Højsgaard wrote:

> Dear all,
> In SAS (GLM and MIXED) estimable functions (linear functions of the
> parameters) can be specified in the ESTIMATE and CONTRAST statements.
> Has anyone written a similar "utility" for use in connection with lm?

?contrast, ?contrasts

This is a very general facility in S, and you may need to read up on it
(I recommend Bill Venables' account in MASS).

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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