[R] Logistic Regression

[Thomas Lumley]

On Thu, 16 Aug 2001 fharrell at virginia.edu wrote:

> Soon it will have the fast backward stepdown method
> I put in SAS in 1978 which I believe is in PROC
> LOGISTIC today.  This will be in the Design library's
> fastbw function, which works with many models, is
> very fast, approximate but surprisingly accurate.
> It is based on approximate Wald statistics.

There is also stepAIC in MASS, based on actual AIC and obeying marginality
constraints, but of course being slower.

	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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