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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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