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Re: st: xmelogit error message


From   KOTa <kota.alba@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xmelogit error message
Date   Mon, 22 Oct 2012 16:56:31 +0200

Hi Nick,

probably i didnt explain myself clearly.

"simplify it first and then complicate it gradually to see what is problematic."

this is exactly what i do, the moment i add to the model any
categorical variable with more than 2 levels - error message appears.
all other variables are ok

On Mon, Oct 22, 2012 at 1:54 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> -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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