[R-sig-ME] Fixed effects only model with lme4

[Ryan Hope]

lmer requires a random effect's term so I doubt you can compare a lm
object to a lmer object

On 6/6/09, Jeroen Ooms <jeroenooms at gmail.com> wrote:
> 2009/6/6 Douglas Bates <bates at stat.wisc.edu>
>
>>
>>
>> Try listing them the other way around
>>
>> anova(fm1, fm0)
>>
>> If the first model in the call to anova is of class "lm" then the
>> method for that class is the one chosen and that method doesn't know
>> about models created by lmer.  You must list them so that the lmer
>> model comes first.
>
>
> this still returns an error:
>> fm0 <- lm(Reaction ~ Days, sleepstudy);
>> fm1 <- lmer(Reaction ~ Days + (1|Subject), sleepstudy);
>> anova(fm0,fm1);
> Error in x$terms : $ operator not defined for this S4 class
>
>> anova(fm1,fm0);
> Error in FUN(X[[1L]], ...) :
>   no slot of name "call" for this object of class "lm"
>
> similar error if I use glm instead of lm.
>
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