lmer

Since the recent update to package lme4, I now get an error when trying to
print the results using lmer to obtain model estimates for anything other
than a liner mixed model.  For example, 

(fm1 <- lmer(decrease ~ treatment + (1|rowpos) +
(1|colpos),family=poisson(),
             data=OrchardSprays))

Produces the error:

Error in checkSlotAssignment(object, name, value) : 
        Assignment of an object of class "NULL" is not valid for slot
"frame" in an object of class "summary.lmer"; is(value, "data.frame") is not
TRUE
Error in show(new("summary.lmer", object, useScale = TRUE, showCorrelation =
FALSE)) : 
        Unable to find the argument "object" in selecting a method for
function "show"

My version information:

platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    0.1            
year     2004           
month    11             
day      15             
language R      

Any help greately appreciated!

David Barron wrote:

Since the recent update to package lme4, I now get an error when 
trying to
print the results using lmer to obtain model estimates for anything other
than a liner mixed model.  For example,
(fm1 <- lmer(decrease ~ treatment + (1|rowpos) +
(1|colpos),family=poisson(),
             data=OrchardSprays))

Produces the error:

Error in checkSlotAssignment(object, name, value) :         Assignment 
of an object of class "NULL" is not valid for slot
"frame" in an object of class "summary.lmer"; is(value, "data.frame") 
is not
TRUE
Error in show(new("summary.lmer", object, useScale = TRUE, 
showCorrelation =
FALSE)) :         Unable to find the argument "object" in selecting a 
method for
function "show"

Yes, the recent version has also some inconsistancy with the mlmRev 
package, perhaps a bug .... Doug Bates certainly knows better.

Version 0.95-1 has not had this problem (but others, I think).
If you want to "downgrade" for the meantime,
check out CRAN/bin/windows/contrib/2.0/last/
with "old" versions of Matrix, lme4 and friends.

Uwe Ligges

My version information:

platform i386-pc-mingw32
arch     i386           os       mingw32        system   i386, 
mingw32  status                  major    2              minor    
0.1            year     2004           month    11             
day      15             language R     
Any help greately appreciated!