[R-sig-ME] Nest survival: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in pwrssUpdate

[Elwyn Sharps]

Hi Ben

Thank you very much for your reply. If you click on this link, it should
give you the data in a CSV file.
https://sites.google.com/site/es263datahlp/habitat-type_example.csv

Many thanks

Elwyn

On 5 March 2015 at 03:11, Ben Bolker <bbolker at gmail.com> wrote:

> Elwyn Sharps <e.sharps at ...> writes:
>
> >
>
> [snip]
>
> > I am using a nest survival model (glmer) with random effects and a
> logistic
> > exposure link function, as described here:
> >
> >
> http://stackoverflow.com/questions/19012128/user-defined-link-function-for-
> > glmer-for-known-fate-survival-modelling
> >
> > I am running a number of different models, with varying fixed effects.
> Some
> > of them are running well, with no error or warning messages, however
> > for other models, I am getting the following message:
> >
> > *Error: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in
> > pwrssUpdate*
> >
> > I'm not sure what is causing this error. I have tried to check the data
> for
> > simple problems, however can't see anything that could be causing
> trouble.
> >
> > I've also tried running the model without the random effects. This
> results
> > in a different error message:
> >
> > *Error: cannot find valid starting values: please specify some*
>
>   Example data doesn't seem to be attached: it may have been
> stripped by the mailing list software.  Can you post it somewhere
> public and provide a URL?
>
>   My guess it that there is something rather wonky about the data
> for this example, e.g. complete separation (for example, no individuals
> die for some combination of predictor variables).  Hard to say
> without the data though.
>
>   Ben Bolker
>
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