[R-sig-ME] lme4, failure to converge with a range of optimisers, trust the fitted model anyway?

[Hans Ekbrand]

> > > While I'm thinking of it, should clusters and country random effects have
> > > been crossed. Generally the sampling is setup so that clusters are nested
> > > within countries which requires a different syntax.
> >
> > I'm sorry but I haven't been clear on this, but the clusters are
> > nested within countries, so there are no crossed random effects to be
> > found.
> >
> >
> The  random effect then needs to be included as (1|country/clusterID)

Well, no, cluster is implictly nested in country, just as sample is
implicitly nested in batch in the Pastes data (see p 39-40 in
http://lme4.r-forge.r-project.org/book/Ch2.pdf)