[R-sig-ME] Error messages when running ZIP and ZINB in glmmadmb

[Diego Pavon]

Dear All

After working a bit with ZIP and ZANB models with glmmadmb I have encounter
couple of problems while running the models for some species.

I have count data for 11 species of waterbirds and I am fitting GLMM
poisson, GLMM NB, ZIP and ZINB to the data (each species separately) to
compare and look for the "best model" (lowest AIC). For
some species, all the models run nicely, but for other species, typically
those with a very large % of zeroes (e.g. > 75%), I get an error message:

"Parameters were estimated, but standard errors were not: the most likely
problem is that the curvature at MLE was zero or negative
Error in glmmadmb(Mser ~ WT_DJF_std + ST_pre_std + fHabitat + Mser_pre_std +
:
   The function maximizer failed (couldn't find parameter file)
Troubleshooting steps include (1) run with 'save.dir' set and inspect output
files; (2) change run parameters: see '?admbControl';(3) re-run with
debug=TRUE for more information on failure mode
In addition: Warning message:
running command 'C:\Windows\system32\cmd.exe /c glmmadmb -maxfn 500 -maxph 5
-noinit -shess' had status 1"

After reading some of the posts here, the solution does not seem straight
forward to me.
Do you have an idea why the models run for some but not for other species?
Do you have an idea how to deal with it? The covariates are standardized.
When I write the noinit=TRUE and the Shess=TRUE, it says that "it cannot be
found". I have written the verbose = TRUE, but I do not understand what it
all means.

I would very much appreciate any kind of insight.

Thank you very much for your time and help!

Best regards

Diego

-- 
*Diego Pavón Jordán*

*Finnish Museum of Natural History*
*PO BOX 17 *

*Helsinki. Finland*



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