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

[Jim Lindsey]

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.
  Jim
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