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st: Weibull syntax in Stata 8


From   "Sarah Hamilton" <shamilton@dfpm.utah.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Weibull syntax in Stata 8
Date   Mon, 24 Feb 2003 12:53:16 -0700

In Stata 8, there is a new command called nlcom where you can 
define your parameters for a given distribution.  I have the 
following code for defining the Weibull distribution and I 
haven't been able to decipher from help files or online how to 
interpret it.  Does anyone know what the code following each 
parameter (theta and beta) means in Stata 8?  I would like to 
know how it relates back to the pdf of the Weibull 
distribution.  Thanks for any help. 

nlcom (theta:exp([ln_p]_b[_cons])) (beta:exp(-_b[_cons]))

Sarah Hamilton

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