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st: problem using predictnl after obtaining non-linear estimates


From   Lopa Chakraborti <lchakraborti@arec.umd.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: problem using predictnl after obtaining non-linear estimates
Date   Sat, 25 Oct 2008 17:18:23 -0400

Hi,
I wrote a simple non-linear least squares program. Using the estimates I am trying to find confidence intervals etc. for one of the components of the equation. The error message I keep getting is: "Warning: prediction doesn't vary with respect to e(b)." and it calculates the predicted value but does not generate standard errors etc.
Any advise on this would be greatly appreciated
thanks
Lopa

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