On Wed, 10 Sep 2008, Prof Brian Ripley wrote:
As to why the list of links known by name is as it is, that seems history. in
part the White Book history of S. I've always thought it an error that 'log'
was a standard link for binomial, as the range does not match the
specification of probabilities (and S did not do so, MASS Table 7.1 ).
I think I added binomial("log"): log-binomial regression is quite popular
and useful in epidemiology (where effect sizes are small enough that
keeping away from the boundary may be less of a problem than people's
inability to understand odds ratios).
As a side note, in (some versions of) S, due to partial matching,
binomial("log") is valid -- it just does logistic regression.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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