[R-sig-ME] Radio silence in re "newdata" argument of simulate.merMod(): PS

John H Maindonald jhm@|ndon@|d @end|ng |rom gm@||@com
Mon Aug 8 05:00:26 CEST 2022

I read your message too casually, and failed to notice the attachments.
The issues may be that levels of `period` are not balanced within levels of
`herd`, either in `cbpp` or in `X`.  The following works:

fit   <- glmer(cbind(incidence, size - incidence) ~ 0 + period + (1 | herd),
               family = binomial, data = cbpp)
X     <- subset(data.frame(herd=factor(rep(1:30,each=4)),size=rep(40,120), 
                        period=factor(rep(1:4,30))), herd==1)
X[,'herd'] <- rep(factor('new'),nrow(X))
s.mer1 <- simulate(fit,newdata=X,allow.new.levels=TRUE)

John Maindonald.

> On 8/08/2022, at 11:13, Rolf Turner <r.turner using auckland.ac.nz <mailto:r.turner using auckland.ac.nz>> wrote:
> Three days ago I sent an email to r-sig-mixed-models asking what I was
> doing wrong in my use of the "newdata" argument of simulate.merMod().
> So far I have received no response at all.  This surprises me.  I
> expected a quick reply, from Ben Bolker (or someone like him) to the
> effect of "You absolute ninny.  *This* is (obviously!) the syntax that
> you should be using."
> Was my question unclear or too obscure or arcane?  If so, are there any
> suggestions as to how I could be more perspicuous?
> I really would appreciate some help.
> cheers,
> Rolf Turner
> -- 
> Honorary Research Fellow
> Department of Statistics
> University of Auckland
> Phone: +64-9-373-7599 ext. 88276
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