[R] random interaction effect in lmer

[Jason Morgan]

Hello Federico,

You should try sending this to the mixed models mailing list (link
below). Also, it would probably help to know what the data looks like. With the
information you provide, it's hard to say what the problem could be.

r-sig-mixed-models at r-project.org

Best,
~Jason

On 2011.02.06, Federico Bonofiglio wrote:
> Hi dears while modeling an interaction random effect in lmer i receive the
> instantaneous error message
> 
> > ldlM4<-lmer(ldl~rt*cd4+age+rf+pharmac+factor(hcv)+
> + hivdur+(rt:cd4|id),na.action=na.omit,REML=F)
> *Warning message:
> In mer_finalize(ans) : false convergence (8)
> *
> I think the matter lies in syntax, 'cause i sistematically receive the same
> message even when changing response...
> PS: the above model runs quite well in lme and only rarely I recive :
> *
> Errore in lme.formula(fixed = ldl ~ rt + cd4 + age + rf + pharmac +
> factor(hcv) +  :
>   nlminb problem, convergence error code = 1
>   message = iteration limit reached without convergence (9)
> *
> ..reason for which I switch  into lmer
> 
> Thank u in advance foe any hints...;)
> -- 
> *Little u can do against ignorance,....it will always disarm u:
> is the 2nd principle of thermodinamics made manifest, ...entropy in
> expansion.**....But setting order is the real quest 4 truth, ......and the
> mission of a (temporally) wise dude.
> *
> 
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-- 
Jason W. Morgan
Ph.D. Candidate
Department of Political Science
*The Ohio State University*
154 North Oval Mall
Columbus, Ohio 43210