What type of error do you get if it has a false converge?  Does it raise an
error (if so, ?try).  Is there some value you can test for?  You need to
provide more details as to what happens.

On Mon, Jan 11, 2010 at 6:06 PM, Rense <rense.nieuwenhuis@gmail.com> wrote:

>
> Hi,
>
> I'm running some data simulations using (mixed effects)* regression models
> that show difficulty to converge. Therefore, I seek a way of capturing
> warnings (of false convergence) inside a loop.
>
> Inside that loop, I modify data and estimate a model. I do so many times
> with slightly different modifications of the data. Next, I extract some of
> the model parameters and store these in a matrix. However, as some of the
> models do not converge well, some of the stored parameters are extracted
> from the ill-converged models. Therefore, I seek a way of automatically
> detecting whether the estimation procedure has resulted in a warning, so I
> can distinguish between the well- and ill-converged models.
>
> I have been trying to use functions as warnings(), as well as using the
> object last.warning, but unfortunately to no avail.
>
> Although I cannot provide a reproducible example, I schematically represent
> the procedure I seek to use below:
>
>
> for (i in 1:10)
> {
> <<modify data>>
> <<estimate model>>
>
> <<<evaluate whether estimation produced warning>>>
>
> <<extract model parameters, and store whether warning occured>>
> }
>
> I hope any one can give some guidelines on how to deal with warnings inside
> a loop.
>
> With Kind regards,
>
> Rense
>
>
>
>
>
> *Although I use the lme4 package for that actual analysis, I sent my
> question to this mailinglist (instead of the R mixed list) because I
> believe
> this is a general issue, rather than one associated exclusively with mixed
> models.
> --
> View this message in context:
> http://n4.nabble.com/warning-inside-loop-tp1011667p1011667.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

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