chchjames <james.mccarthy <at> windowslive.com> writes:
[snip]
> I am using the alpha version of glmmadmb, and it works for most of the time
> except for one of my models. The weird thing is that it has worked before, a
> couple of months ago, and for some reason it won't now and nothing has
> changed.
>
> The code is:
> nbin5<-glmmadmb(stainp~beetle.ev+Caged*Section/SegmentT+
> (1|Site)+(1|Log.code),data=dat1,family="nbinom")
>
> And it thinks for a while before giving me the error:
> Error in glmmadmb(stainp ~ beetle.ev + Caged * Section/SegmentT + (1 | :
> The function maximizer failed
> In addition: Warning message:
> running command './glmmadmb -maxfn 500' had status 1
Have you tried running it with verbose=TRUE ?
> I have narrowed it down, and the factor it has trouble with is "beetle.ev".
> This is a column of binary data which is presence or absence of beetles.
> There are only 0's and 1's in this column. The really weird thing is that I
> have another column for a different beetle ("beetle"), binary also, which
> works fine!
{I am one of the authors of glmmADMB}
It is pretty much impossible that the same code worked before on
the same data and that truly *nothing* has changed. There must (?)
have been some minor change to the code or to the data,
even something apparently innocuous (and possibly a forehead-slapper
when you do figure out what it was).
This is not a reproducible example, so I can't really diagnose
it. Running with verbose=TRUE and posting the (voluminous) output
would help, but the best thing would be if you can post the data
somewhere, or a similar data set that displays the same problem.
glmmADMB is a somewhat special-purpose package (being built
on AD Model Builder); you might want to consider sending follow-ups
to the AD Model Builder mailing list.
Ben Bolker
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