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Lopa said
Upon inserting the @ symbol it gives me a error message:
nl wqfinalnoseasonfinal3 @ downstreamwaterqualityfoia04, nparameters(90)
@ invalid name
r(198);
Is it because I work with Stata 8.2 version?
From -help whatsnew8to9-:
10. Existing command nl has a new syntax that makes estimating
nonlinear
least-squares regressions easier. For most models,
estimation is now as easy as
typing the nonlinear expression. Full programmability has
been retained for
complex models, and the old syntax continues to work.
nl also now supports robust (Huber/white/sandwich) and
cluster-robust SE and VCE
estimates, including two popular adjustments that can
dramatically improve the
small-sample performance of robust SE and VCE estimates.
A number of new reporting and estimation options have also
been added. See [R]
nl.
You may be right that the syntax of -nl- is different now. However you
will have to find someone who has Stata 8.2 handy to assist with your
program. I have Stata 9 on one machine, but have long since removed
Stata 8.2. I have no idea how the old syntax of a function evaluator
program differs (although I think it is the same in versions 9 and 10).
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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