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st: RE: Initial values maximum likelihood


From   "FEIVESON, ALAN H. (AL) (JSC-SK) (NASA)" <alan.h.feiveson@nasa.gov>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Initial values maximum likelihood
Date   Fri, 16 Apr 2004 10:33:36 -0500

Alejandro - There is a rather arcane description of how to set initial
values on pp.115-6 of the ml-manual. Perhaps I can save you some frustration
by giving you a simple example where you are only setting values for the
"constant" terms in each linear combination:


ml model lf radpow (zal:`1'= ) (zbe:`3') (ga: ) 
ml init  zal:_cons=-5.0  /zbe:_cons=-3.5 /ga:_cons=1.5  

Quite often, however, the reason you get the "could not find feasible
values" message is because something is wrong with the way your likelihood
is calculated (trying to take log of a negative number, or partially missing
data, etc)

Hope this helps

Al Feiveson





-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of
feldman@primal.ucdavis.edu
Sent: Thursday, April 15, 2004 3:01 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Initial values maximum likelihood


Hi all,

How do you set initial values in a maximum likelihood
program? 

I am trying to run a ML program using lf and d0 but with ML
search the computer can't find values to solve my program
using ml search and I get the message "could not find
feasible values" does that mean that my program is wrong?
When I run ml check it stops after test 2 and gives back the
same error message. Can I solve this by specifying inital
values? 

Thanks, 
Alejandro 

Alejandro Lopez-Feldman
Ph.D. Candidate
UC DAVIS
Agricultural and Resource Economics
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