[R] refit with binomial model (lme4)

[Eric Elguero]

On Mon, 2009-04-27 at 08:30 -0500, Douglas Bates wrote:
> This is related to using the matrix form of the response for a
> binomial glmm.  The refit method for a model fit by lmer is based on a
> numeric vector response.
> 

thank you for this explanation.

> Is it possible to use the expanded form (i.e. a vector of 0/1 values)
> of the responses instead of the matrix form?
> 

yes I could but I found that I could use the
probability/weights form, at least in my case 
where I am simulating new binomial data with
the observed number of trials.

Eric Elguero

> On Mon, Apr 27, 2009 at 7:20 AM, Eric Elguero <Eric.Elguero at mpl.ird.fr> wrote:
> > Dear R users,
> >
> > I'm trying to use function 'refit' from lme4
> > and I get this error that I can't understand:
> >
> >> refit(dolo4.model4,cbind(uu,50-uu))
> > Error in function (classes, fdef, mtable)  :
> >  unable to find an inherited method for function "refit", for signature
> > "mer", "matrix"
> >
> > if I try:
> >
> >> refit(dolo4.model4,uu)
> > Error in asMethod(object) : matrix is not symmetric [1,2]
> >
> > I get this error message that I can no more
> > understand but which suggests that refit expects
> > two columns.
> >
> >
> > the initial model was:
> >
> >> dolo4.model4 at call
> > glmer(formula = cbind(sortis, restes) ~ mean.co2 + (1 | sujet),
> >    data = dollo4.df, family = binomial)
> >
> >
> >
> > R version 2.9.0 (2009-04-17)
> >
> > and
> >
> > Package: lme4
> > Version: 0.999375-28
> > Date: 2008-12-13
> >
> > thank you in advance
> >
> > e.e.
> >
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> >