offset arg (was Re: [R] variable scope)
Sat, 3 Aug 2002 11:25:29 +0100 (BST)

On 3 Aug 2002, Peter Dalgaard BSA wrote:

> Another example that has come back to haunt us several times is
> lm(...,data=d,offset=foo). The problem is that we want "foo" to be
> found inside "d" if present, but call-by-value semantics imply that it
> is an object in the caller's scope. You really ought to pass the name
> "foo" (or maybe better: quote(foo), or a formula ~foo).

Should we not just deprecate the offset argument in lm and glm?  Using the
offset() function in the formula works as one would expect (at least if
one remembers the R rules which start at the formula's environment).

Brian D. Ripley,        
Professor of Applied Statistics,
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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