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RE: st: backed up


From   sun samn <shwshang@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: backed up
Date   Mon, 28 Jun 2010 01:46:34 +0800



Hi, stats,
  Thanks for your response. What do you mean by 'iterations being concave'? I did encounter another situation--the same number kept being iterated but cannot converge.
Thanks again!

sam 






----------------------------------------
> Date: Sun, 27 Jun 2010 12:07:12 -0500
> Subject: Re: st: backed up
> From: skolenik@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> RTFM on -optimize()-, and on numeric optimization, in general. It
> means that the optimizer had to make the step for the current
> iteration way shorter than what the (reasonably good, in most
> situations) default would have to be. You only need to worry about the
> last few iterations being concave; other than that, the messages only
> serve as warnings that your function is difficult to optimize.
>
> On Sat, Jun 26, 2010 at 7:13 PM, sun samn  wrote:
>>
>>
>> Hi, folks,
>>    I did a optimization problem in stata, and I get the following result:
>>
>> :   b2=optimize(S)
>> Iteration 0:  f(p) =  1.6019994
>> Iteration 1:  f(p) =  1.6019994  (backed up)
>>
>>
>> does someone know the meaning of 'backed up'? Is there anyway to fix it?
>> thanks,
>>
>> sam
>>
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>
>
>
> --
> Stas Kolenikov, also found at http://stas.kolenikov.name
> Small print: I use this email account for mailing lists only.
>
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