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st: Maximum-likelihood estimation

From   David Greenberg <[email protected]>
To   [email protected]
Subject   st: Maximum-likelihood estimation
Date   Mon, 02 Feb 2004 20:05:51 -0500

I am trying to learn the maximum-likelihood procedure in  Stata SE version 8, but am getting error messages when following illustrative examples, one from someone's web site, the other from the Stata manual. Perhaps someone can tell me what I'm doing wrong.
   Here is the first example:
program define mylogit
   args lnf Xb
   replace `lnf' = -ln(1+exp(-`Xb')) if $ML_y1==1
   replace `lnf' = -`Xb' -ln(1+exp(-`Xb')) if $ML_y==0
ml model lf mylogit (foreign=mpg weight)
ml maximize
    At this point I get the message 
 varlist required
What do I need to do to fix the syntax?  
                      David Greenberg
                      Sociology Department
                      New York University

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