[R] error in plot.lmList

[Arne.Muller@sanofi-aventis.com]

Hello,

in R-2.1.0 I'm trying to prodice trellis plots from an lmList object as described in the help for plot.lmList. I can generate the plots from the help, but on my own data plotting fails with an error message that I cannot interpret (please see below). Any hints are greatly appreciapted.

	kind regards,

	Arne

> dim(d)
[1] 575   4
> d[1:3,]
  Level_of_Expression SSPos1 SSPos19 Method
1                11.9      G       A   bDNA
2                24.7      T       T   bDNA
3                 9.8      C       T   bDNA
> fm <- lmList(Level_of_Expression ~ SSPos1 + SSPos19 | Method, data=d)
> fm
Call:
  Model: Level_of_Expression ~ SSPos1 + SSPos19 | Method 
   Data: d 

Coefficients:
           (Intercept)   SSPos1C    SSPos1G   SSPos1T SSPos19C SSPos19G   SSPos19T
bDNA          25.75211 -6.379701  -9.193304 10.371056 24.32171 24.06107  9.7357724
Luciferase    23.79947  4.905679  -7.747861  8.112779 48.95151 48.15064 -0.2646783
RT-PCR        56.08985 -7.352206 -15.896556 -2.712313 19.91967 24.28425 -2.2317071
Western       14.03876  2.777038 -14.113157 -7.804959 24.62684 25.50382  8.3864782

Degrees of freedom: 575 total; 547 residual
Residual standard error: 25.39981
> plot(fm, Level_of_Expression ~ fitted(.))
Error in plot.lmList(fm, Level_of_Expression ~ fitted(.)) : 
        Object "cF" not found

what is object cF ...?