[R] correlation structures in NLME

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Aug 12 23:24:14 CEST 2004

On Thu, 12 Aug 2004, Michael Jerosch-Herold wrote:

> I am using the latest version of R on a Windows machine and get the
> following error when I try to initialize a correlation structure with
> the function corAR1 in NLME. This example is taken from the book of
> Pinheiro and Bates, so it should work. What is going wrong?

That book is about S(-PLUS), so there is no reason why it `should work' in

> > library(nlme)
> > data(Orthodont)
> > cs1AR1 <- corAR1(0.8, form= ~1 | Subject)
> > cs1AR1 <- initialize(cs1AR1, data = Orthodont)
> Error in methodsPackageMetaName("C", name) : 
>         The name of the object (e.g,. a class or generic function) to
> find in the meta-data must be a single string (got a character vector of
> length 2)
> In addition: Warning message: 
> the condition has length > 1 and only the first element will be used
> in: if (!is.na(match(Class, .BasicClasses))) return(newBasic(Class,  


> find("initialize")
[1] "package:methods"

so that's not right.

Have you looked in the R scripts in package nlme?  I think it is
Initialize() in R.

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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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