[R-sig-ME] predict in lmer()?

[David Winsemius]

On Jul 31, 2011, at 9:35 AM, David Winsemius wrote:

>
> On Jul 31, 2011, at 8:47 AM, Dennis Murphy wrote:
>
>> Hi:
>>
>> See http://glmm.wikidot.com/faq
>>
>> Go about 2/3 of the way down until you see the section 'Predictions
>> and/or confidence (or prediction) intervals on predictions'.
>
> Aren't objects created by lmer of class "mer"? Attempting to follow  
> your advice with the first example provided in ?lmer meets with  
> frustration:
>
> require(lme4)
> (fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy))
> newdat0 <- expand.grid(Reaction=c(200,300,400), Days=c(0,4,8),  
> Subject=c(5,10,15) )
> newdat0$pred <- predict(fm1, newdat0, level = 0)
>
> Error in UseMethod("predict") :
>  no applicable method for 'predict' applied to an object of class  
> "mer"
>
> I'm not even a journeyman use of ME methods, so this is just a  
> question. Do you have a fix? (There are predict methods listed in  
> nlme but none in the Index of lme4.


And then I scrolled a bit further down beyond the lme section to where  
the lme4 section was . Sorry for the noise. And thanks for the  
addition to my meager lme4 education.
-- 
David.

David Winsemius, MD
West Hartford, CT