What is the . in formula ~. syntax?
On Nov 23, 2012, at 4:26 AM, Brian Feeny <bfeeny at 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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