On 23/11/2012 08:16, Brian Feeny wrote:
Thank you! I searched in the manual, but I did not see where this is
mentioned, I looked under operators
and in some of the formula documentation.
It *is* documented on the help page for formula (and it is not an
operator, so should not be in the documentation for operators):
There are two special interpretations of ‘.’ in a formula. The
usual one is in the context of a ‘data’ argument of model fitting
functions and means ‘all columns not otherwise in the formula’:
see ‘terms.formula’. In the context of ‘update.formula’, *only*,
it means ‘what was previously in this part of the formula’.
In other contexts it is literally '.' (see ?terms.formula).
Brian
On Nov 23, 2012, at 3:15 AM, Michael Weylandt <michael.weyla...@gmail.com>
wrote:
On Nov 23, 2012, at 4:26 AM, Brian Feeny <bfe...@mac.com> wrote:
I know if I have a dataframe with columns y, x1, x2 and I wish to have y as my
y value and x1 and x2 as x values I can do:
y ~ x1 + x2
or
y ~.
but can someone explain what . actually is or what its transposed into?
Everything not already stated.
rmw
I searched for this with no success, reading the "formula" manual pages.
Brian
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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