On Tue, Jun 15, 2010 at 9:47 AM, Farhad Shokoohi <statfar at gmail.com>
wrote:> Dear All,
> I have a problem running this program on R. Z is a ?matrix of spline which
is random
>> fit<-lme(anc~X,random=pdIdent(~Z))
> Error in getGroups.data.frame(dataMix, groups) :
> ?Invalid formula for groups
> What I have done wrong?
You didn't read the posting guide.
http://www.R-project.org/posting-guide.html
A little more information on the data is necessary. Please provide
minimal, self-contained, reproducible code that mimicks the error.
This said, I do not understand what you want to do with
"random=pdldent(~Z)". I cannot find a function pdldent, so this
notation doesn't make any sense.
Cheers
Joris
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Joris Meys
Statistical consultant
Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
tel : +32 9 264 59 87
Joris.Meys at Ugent.be
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