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Re: st: Could not find feasible values(was: Syntax problems with maximum likelihood (method lf))


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Could not find feasible values(was: Syntax problems with maximum likelihood (method lf))
Date   Thu, 30 Oct 2008 11:51:31 +0000 (GMT)

This is typically an indication that there is an error in your
likelihood function. I know that this can be very frustrating but all
we can say is check that likelihood function again in detail. It is
much harder for us to do so as we don't know what the likelihood should
be. 

-- Maarten

--- Katia Bobulova <katia.bobulova@googlemail.com> wrote:

> Dear all,
> 
> thank you very much for your answers.
> 
> I finally sorted out the problem with my program.
> 
> However, when I typed ml check I received this message:
> 
> The initial values are not feasible.  This may be because the initial
> values have been chosen poorly or because there is an error in my
> program and it always returns missing no matter what the parameter
> values.
> 
> Stata is going to use ml search to find a feasible set of initial
> values. If myprogram is broken, this will not work and you will have
> to press Break to make ml search stop.
> Searching...
> initial:       log likelihood =     -<inf>  (could not be evaluated)
> searching for feasible values
> ..................................................
> could not	find	feasible	values
> r(491);
> 
> What should I do to modify myprogram so that it works? Is it possible
> that the problem is the number of observations, i.e. they are not
> enough?
> 
> Could you please help me?I have really no idea of how to adjust my
> data.
> 
> Thanks
> Katia
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
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> 


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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