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Re: st: RE: Newton-Raphson (not concave)


From   Dimitrije Tišma <[email protected]>
To   [email protected]
Subject   Re: st: RE: Newton-Raphson (not concave)
Date   Wed, 14 Apr 2010 15:43:43 +0200

Thanks a lot, Nick, I really appreciate your answer.

Dimitrije




2010/4/14 Nick Cox <[email protected]>:
> I'd say that while failure to converge is almost always diagnostic of a poor model (or poor data), small struggles in convergence are rarely diagnostic of anything much, especially with complicated models like these.
>
> But wondering whether a simpler model is preferable is always good science and good statistics.
>
> Nick
> [email protected]
>
> Dimitrije Tišma
>
> I am running a multi-level random intercept model and after the
> adaptive quadrature has converged I have got four consecutive
> iterations with (not concave) message. If the model does converge
> should I believe my results or should I try another simpler model by
> taking out one or two variables?
>
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