[R] Contrasts in lm

[Prof Brian Ripley]

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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