[R] extractAIC.survreg problem with df

[Prof Brian Ripley]

There has been a change in the survreg function since that was written 
....

On Wed, 21 Apr 2004, Stefano Calza wrote:

> Hi everybody.
> 
> I'm having problems with the extractAIC.survreg function and the edf
> 
> I get weird results which I think are due to the fact that the function defines edf as (from the stats package in 1.9.0 source code)
> 
> ...
> ...
> n <- length(fit$residuals)
> edf <- n-fit$df.residual
> ...
> 
> But in a survreg object there's no attribute residuals!!??
> 
> if in the function I use instead
> 
> ...
> n <- length(residuals(fit)
> ...
> 
> everything's fine, or better
> 
> ...
> edf <- fit$df
> ...
> 
> Am I missing something?
> 
> TIA,
> Stefano
> 
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-- 
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)
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