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

[Jim Lindsey]

> 
> 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
> options(show.signif.stars=FALSE)
> ps.options(horizontal=FALSE)
> 
> 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
> .../library/base/R/Rprofile.

So do I. The problem does not lie there. It is in teaching. If I turn
them off in the teaching rooms at the university, the students are
disconcerted because output does not look the same when they do it at
home with their copy of R downloaded directly from the web. Hence, it
is necessary for the default option to be off. Jim

> 
> -- 
> 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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