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Re: st: xmelogit error message


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xmelogit error message
Date   Mon, 22 Oct 2012 12:54:52 +0100

-xtmelogit- is finding difficulty fitting your model. The most obvious
thing to do is to simplify it first and then complicate it gradually
to see what is problematic.

Nick

On Mon, Oct 22, 2012 at 12:29 PM, KOTa <kota.alba@gmail.com> wrote:

> i am using xmelogit to estimate the model where some IV are categorical.
>
> when i am trying to use IV which are categorical predictors with more
> then 2 levels (i.e. not just 0/1 - those are added without problems)
>
> e.g. i.status , where status values are A to F (encoded as numbers)
>
> i receive a following message:
>
> "numerical derivatives are approximate
> flat or discontinuous region encountered"
>
> what does it mean?
> i dont use those variables correctly?
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