[R] logistic regression

Liaw, Andy andy_liaw at merck.com
Mon Aug 2 17:50:53 CEST 2004

My suggestion would be a generalized additive model, which you can fit with
gam() in the `mgcv' package.  If you are adventureous you can also try it
`by hand' using glm() with spline terms.  You might also try lrm() with
splines (in the `Design' package) as described in Prof. Harrell's book
`Regression Modelling Strategies'.


> From: Kevin Cummins
> I have a system with a binary response variable that was 
> hypothesized to 
> follow a simple logistic function. The relationship between 
> the continuous 
> independent variable and the logit is clearly not monotonic. 
> I have two 
> questions. 1) Can anyone recommend a reference that describes 
> my modeling 
> options in this case, and 2) what facilities does R have to 
> deal with this 
> situation?
> Thanks,
> Kevin Cummins
> School of Medicine
> University of California San Diego
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