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RE: st: documentation on iteration for a non linear regression


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: documentation on iteration for a non linear regression
Date   Wed, 13 Jun 2012 15:50:53 +0100

It all depends on what command you are using. You don't say what command you used previously (another piece of advice being ignored), but after -nl- (for example) common steps would be 

mat b = e(b) 

di b[1,1] 

di b[1,2] 

scalar b1 = b[1,1]

scalar b2 = b[1,2] 

Nick 
n.j.cox@durham.ac.uk 

tashi lama

Sorry, I read and reread the manual. I am confused. The manual says _b[varname] and _se[varname] to access the coeff and standard error of a var and _b[_cons] and _se[_cons] to access the coeff and standard error of a constant. I am fitting a exponential model y=b1*b2^x to my dataset and got e(b) as

  mat li e(b)

  e(b)[1,2]
           b1:        b2:
        _cons      _cons
y1   632.7252  .33046311

 di _b[_cons] gave me the coeffiecient i.e. 632.73. In the same spirit, I would assume I do   di _b[x] to get the coeff of x. There is an error which reads [x] not found. Any idea?

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