[R] leverage

[Peter Dalgaard BSA]

Martin Maechler <maechler at stat.math.ethz.ch> writes:

> >>>>> "jane" == jane murray <jmurray at liverpool.ac.uk>
> >>>>>     on Wed, 06 Aug 2003 09:16:48 +0100 writes:
> 
>     jane> Hi Can anyone help with the technique of obtaining
>     jane> leverages from a conditional logistic regression
>     jane> model?  The code lm.influence does not seem to work
>     jane> for this data.  Thanks Jane Murray
> 
> But the generic  influence()  function {new in 1.7.0, from original
> code of John Fox} has an S3 method, influence.glm(), that should work.
> If not, that might indicate a bug we'd be interested to hear about.

I suspect you overlooked the "conditional" there. I.e. this is for
models fitted using clogit() from survival (and I think it has a
competitor, but I forgot where..) Since this works by hijacking coxph
it probably cannot work to apply GLM methods on the result.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907