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st: re: problem using predictnl after obtaining non-linear estimates


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: problem using predictnl after obtaining non-linear estimates
Date   Sat, 25 Oct 2008 20:09:10 -0400

< >
The help for -nl- function evaluator programs states that

* For function evaluator program version, you must specify parameters(namelist) or nparameters(#), or both.

You have not done that. I am surprised that Stata does not generate a syntax error.

Furthermore the invocation of -nl- should be

nl wqfinalnoseasonfinal2 @ downstreamwaterqualityfoia04  etc.

The at sign (@) is not optional.

If you specify parameters() or nparameters() properly, then -nl- (like any estimation command) should return e(b) and e(V), which are needed by -predictnl-.

See what happens when you follow the syntax specified in -help nl-.


Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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