Details control options for glmmADMB

ADMB runs its optimization in 'phases' where a progressively larger
subset of the parameters are estimated (in earlier phases, some
parameters are fixed to default values).  If you look in the definition
(TPL) file

file.show(system.file("tpl","glmmadmb.tpl",package="glmmADMB"))

and search for 'phase' you'll see that different phases are used for the
overdispersion parameters, zero-inflation parameters, random effects
standard deviations, random effects correlations.

  That said, I haven't actually seen a context where I've actually
needed to use this feature -- often you could just turn off the relevant
part of the model (e.g. zero-inflation) rather than setting
the maximum phase to a smaller value.

For more about phases, the ADMB manuals are at

http://admb-project.org/documentation/manuals/admb-user-manuals

specifically, the current version is at

http://ftp.admb-project.org/admb-11.4/manuals/admb-11.4.1.pdf

Dear all,

I am a PhD student at the University of Helsinki and I would like to
know what exactly the argument "maximum phase" means in the control
options for the glmmADMB package. How does it help/contribute to
solve convergence problems?

Best wishes,


Sara Fraixedas Doctoral Student The Helsinki Lab of Ornithology
(HelLO) Finnish Museum of Natural History P.O. Box 17 00014
University of Helsinki, Finland Tel. +358-9-19128851

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