On Thu, 11 Nov 2004, Achaz Graf Von Hardenberg wrote:
> Sorry...
> I am using s-Plus 2000 and have the MASS version 6.1...should I update to 7.1
> ?
The MASS sofware has not been supported for S-PLUS 2000 since June 2002. I
don't have access to S-PLUS 2000 (it was released 5 years ago now, and
superseded something like 3.5 years ago) to know for sure what is in that
version. However, it looks like a vcov method for lme came in Version 6.3
and that the updater for S-PLUS 2000 probably gives you that. See
http://www.stats.ox.ac.uk/pub/MASS3/Windows.shtml
which says
2000up.exe [900Kb ] Update for S-PLUS 2000. [Minor corrections and several
enhancements. Also most of the new material from the Fourth Edition. This
update will work on Release 1, 2 or 3] (Current version: 2002 Jun 29)
>
> Achaz von Hardenberg
>
>
>
> Scrive Prof Brian Ripley <ripley@stats.ox.ac.uk>:
>
> > On Thu, 11 Nov 2004, Achaz Graf Von Hardenberg wrote:
> >
> > > Hi,
> > > I would like to obtain the variance-covariance matrix for an lme object
> > > and
> > > terefore tried the following:
> > >
> > > >library(MASS)
> > > >x<- vcov(myobject.lme)
> > >
> > > however, I get the following error message:
> > >
> > > Error in UseMethod("vcov"): no specific or default method found
> > >
> > > What am I doing wrong?
> >
> > Not telling us the version of S-PLUS and of MASS for a start.
> > Here is an example from S-PLUS 6.2 and the current MASS version 7.1pl021
> >
> > > fm1 <- lme(distance ~ age, data=Orthodont) # random is ~ age
> > > vcov(fm1)
> > (Intercept) age
> > (Intercept) 0.60100669 -0.046850866
> > age -0.04685087 0.005077029
> >
> > --
> > Brian D. Ripley, ripley@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
> >
> >
> >
>
>
>
>
--
Brian D. Ripley, ripley@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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