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st: nl syntax help

From   "Ivan Etzo" <[email protected]>
To   <[email protected]>
Subject   st: nl syntax help
Date   Wed, 9 Jan 2008 13:30:54 +0100 (ora solare Europa occidentale)

Dear all,
I'm trying to estimate a nonlinear equation but I'm not sure wether stata is
reading the correct formula. The equation I want to estimate is:
Y1 = b0 - ln (X1) * [ (1 - exp (-b1*5)) /5]
the command I give to stata is:
-nl - (y1 = {b0} - ln(gdp83) * (1 - exp(-1*{b1}*5))/5) 

Using the last command line I'm getting results but It's first time I write
a function in stata so I'd like to know whether I wrote it in the correct

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