[R] Straight

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Nov 1 09:23:36 CET 2000

On Wed, 1 Nov 2000, Zsombor Cseres-Gergely wrote:

> On Tue, Oct 31, 2000 at 08:01:57PM +0000, Prof Brian D Ripley wrote:
> > Tell us exactly what you want, but there is a fair chance it is in base R.
> OK. 1) Linear restrictions of parameters (Rb {=,<,>} c) and confidence

What do you want there: estimation under restrictions or tests of linear
combinations?  The latter is a simple R programming exercise. I don't know
how to do the first easily (nor do I see why I would need to: normally one
can re-parametrize and test nested models via anova),.

> intervals (numerics, not graphics). [I've just tried to be 'polite' and
> gradual, but this is more comfortable; I have not tried MASS yet, but I will.]

MASS has confidence intervals (generic function confint), but again,
a simple R programming exercise for linear models.

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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