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st: ML for a simple estimation


From   Vincenzo <marvin2007@tiscali.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: ML for a simple estimation
Date   Mon, 2 Feb 2009 19:00:58 +0000

Dear All,
I'm very new to ML command. I'm trying to estimate a model using MLE. As you can see in my program (in reality this is a simplified version), I defined the parameters to be estimated in the args string (these are L0 L1 and d).
The other letters in the loglikelihood represent variable.
When I run the program I have an r(198) for invalid sintax.
Maybe the way the program works is not clear to me..

Any suggestion about how to fix the problem i welcome

Thanks,

Vincenzo

_______________________________________

program define maxlik
 args lnf L0 L1 d

quietly replace `lnf' = (2-d0b-d0f)*ln(`L0')+ln((`L1')/(`d')) if $ML_y1==0
quietly replace `lnf' = 1+ln((`L0')/(`d')) if $ML_y1==1

end

  ml model lf maxlik (x=d0b d0f)
  ml maximize

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