[R] lm -- significance of x coefficient when I(x^2) is used

Prof Brian D Ripley ripley at stats.ox.ac.uk
Wed Sep 27 15:01:40 CEST 2000

On Wed, 27 Sep 2000, John Maindonald wrote:

> > From: Jim Lindsey <james.lindsey at luc.ac.be>
> > 
> > Bill's excellent discussion (which I do not reproduce here) describes
> > precisely why I was (and still am) dead against having stars printed
> > as the default option in lm and glm. Let's get rid of that and let
> > people turn them on, if they want, in those cases in which they make
> > sense.
> I agree.  When using R for teaching, they are a serious distraction,
> and I find it absolutely necessary to turn them off.
> There are very obtrusive.  If there was a way to vary the shade of
> grey in which the coefficients or t-statistics were printed, that
> would be more acceptable!

I always forget that that they are turned on by default, for I have

auk% cat ~/.Rprofile

and so never see them.

In short, the out-of-the-box defaults can be over-ridden easily enough,
including the system ones for a teaching lab, say, by changing

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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