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Re: st: mixlcov, sd error message
From
Arne Risa Hole <[email protected]>
To
[email protected]
Subject
Re: st: mixlcov, sd error message
Date
Wed, 17 Jul 2013 15:51:36 +1000
Jessica
First of all, the Statalist FAQ asks you to say if a program is
user-written. -mixlcov- is a post-estimation command that is part of
the -mixlogit- package (SJ, SSC).
-mixlcov- is a wrapper for -nlcom-, and it is -nlcom- that is issuing
the error message. See this thread for a relevant discussion:
http://www.stata.com/statalist/archive/2009-03/msg01244.html
There is no easy fix here I'm afraid. Like Billy suggests you may want
to try simplifying your model.
Arne
On 17 July 2013 00:04, William Buchanan <[email protected]> wrote:
> Without my Stata handy to check documentation, have you checked to see if the command allows you to specify the number of iterations it will attempt to see if the model converges? Also, have you tried using this with a simplified model (e.g., fewer or no covariates)? If you're using seven random coefficients (in the mixed effects sense of a random coefficient) you likely should simplify your model considerably and build it up to determine which of the random coefficients is the source of the difficulty.
>
> HTH,
> Billy
>
> Sent from my iPhone
>
> On Jul 16, 2013, at 6:19, Jessica Boatwright <[email protected]> wrote:
>
>> I am trying to use the "mixlcov, sd" post-estimation command after
>> running a mixlogit model. I get the error message: "Maximum number of
>> iterations exceeded". Here are some details:
>>
>> -I am using Stata/IC 10.1
>>
>> -I am analyzing results from a choice experiment
>>
>> -I have two independent variables with fixed coefficients: one of them
>> is the intercept (the intercept equals one if the respondent chose an
>> alternative and it equals zero if the respondent opted out); the other
>> is my monetary attribute (a continuous variable)
>>
>> -I have 7 independent variables with random coefficients (all of them
>> are dummy variables)
>>
>> Does anyone have any suggestions on how I can get past this error?
>>
>> Thank you,
>> Jessica
>>
>> --
>> Jessica Boatwright
>> Virginia Tech '13
>> Applied Economics M.S. candidate
>> 540-529-9469
>> *
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>> * http://www.stata.com/support/faqs/resources/statalist-faq/
>> * http://www.ats.ucla.edu/stat/stata/
>
> *
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> * http://www.ats.ucla.edu/stat/stata/
*
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