[R] smoothing binary data

[Prof Brian Ripley]

> Date: Tue, 12 Dec 2000 12:24:43 -0700
> From: "Bill Oliver" <wloliver at qwest.net>
> 
> I'm trying to figure out a good way to smooth binary data. The ideal
> approach appears to be the "sm.logit" function in library "sm", but I
> haven't had success with it. Below, is some code illustrating what I've come
> up with so far, but I'm hoping there is a better approach. I'm using R 1.2
> (development) under Windows 98.
> 
> -Bill
> 
> library(MASS)
> data(birthwt)
> attach(birthwt)
> 
> # This doesn't work for me, no matter what h equals
> # Maybe I'm doing something wrong
> library(sm)
> sm.logit(age,low,h=3)

R has changed since that port was done, so 0-weight cases are
ignored by glm.fit.  There is a new version of sm, sm2, out for
S-PLUS and an R port is in final testing.   In fact, the version
on CRAN tomorrow for rw1020 will be 2.0-1.  I am still cross-checking
answers against S-PLUS 6.0, looking for anomalies like this.

In sm2, the function is sm.binomial.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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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