[R] Problem extracting from mer objects

[Ben Bolker]

Chris Ramsborg <ramsborg <at> yahoo.com> writes:

> I am having a problem extracting from "mer" objects.  
>  
> I have constructed my problem using existing datasets.
>  
> Using the following commands:
>  
> require(lme4)
> fm1 <- lmer(Yield ~ 1 + (1 | Batch), Dyestuff)
> fixef(fm1)
> 
> I get the following error message:
> "Error in UseMethod("fixef") : no applicable method for "fixef""
>  

  [FWIW, questions on nlme/lmer might better be directed
to r-sig-mixed-models at lists.r-project.org]

  Do you have the nlme package loaded simultaneously
(you shouldn't) ?
  I can get almost (but not quite) the same error message
by doing the following:

> require(lme4)
Loading required package: lme4
Loading required package: Matrix
Loading required package: lattice
> fm1 <- lmer(Yield ~ 1 + (1 | Batch), Dyestuff)
> fixef(fm1)
(Intercept) 
     1527.5 
> 
> library(nlme)

Attaching package: 'nlme'


	The following object(s) are masked from package:lme4 :

	 BIC,
	 fixef,
	 lmList,
	 ranef,
	 VarCorr 

> fixef(fm1)
Error in UseMethod("fixef") : 
  no applicable method for 'fixef' applied to an object of class "mer"