R help - Mar 2011 - ERROR: gamm function (mgcv package). attempt to set an attribute on NULL

Hello:I run a gamm with following call
:mode<-gamm(A~B,random=list(ID=~1),family=gaussian,na.action=na.omit,data=rs)an
error happened:ERROR names(object$sp) <- names(G$sp) : attempt to set an
attribute on NULLwith mgcv version 1.7-3What so? How can I correct the Error?
Thanks very much for any help.


      
	[[alternative HTML version deleted]]

wang cheng <cheng_wang29 <at> yahoo.com.cn> writes:
> 
> Hello:I run a gamm with following call
>
:mode<-gamm(A~B,random=list(ID=~1),family=gaussian,na.action=na.omit,data=rs)
  an error
> happened:ERROR names(object$sp) <- names(G$sp) : attempt to set an 
  attribute on NULL

with mgcv version 1.7-3
 
What so? How can I correct the Error? Thanks very much for any
help.
> 
  Thank you for telling us that you are using a function within a 
contributed package, but ... 
  Please read the posting guide.  We are unlikely to be able to 
help without a reproducible example, unless you happen to have
encountered a very common error.

 Update: I was able to guess what your problem was and create
my own reproducible example.  You have specified a generalized
additive mixed model (GAMM) without any smooth terms, which means
that you really don't need gamm (or the mgcv package in general)
to do the problem.  

rs <- data.frame(A=1:20,B=1:20,ID=rep(1:2,each=10))
> gamm(A~B,random=list(ID=~1),family=gaussian,na.action=na.omit,data=rs)
Error in names(object$sp) <- names(G$sp) : 
  attempt to set an attribute on NULL

  You could run the model you have requested via

library(nlme)
lme(A~B,random=~1|ID,na.action=na.omit,data=rs)

  good luck
   (it would still be a good idea to read the posting guide,
for future reference!)

    Ben Bolker

Thanks. This is a bug, the source code made an implicit assumption that there 
would always be at least one smooth, when creating the gam object after 
fitting. Fixed for the next release (1.7-5). For now, you could use glmmPQL 
from the MASS library to get an equivalent fit when there are no smooth 
terms.

Simon

On Thursday 10 March 2011 15:07, wang cheng wrote:
> Hello:I run a gamm with following call
>
:mode<-gamm(A~B,random=list(ID=~1),family=gaussian,na.action=na.omit,data=r
>s)an error happened:ERROR names(object$sp) <- names(G$sp) : attempt to
set
> an attribute on NULLwith mgcv version 1.7-3What so? How can I correct the
> Error? Thanks very much for any help.
>
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
-- 
> Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK
> +44 1225 386603  www.maths.bath.ac.uk/~sw283