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From |
Lopa Chakraborti <lchakraborti@arec.umd.edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

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

Date |
Sun, 26 Oct 2008 10:08:36 -0400 |

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? thanks much for your advise ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kit Baum [baum@bc.edu] Sent: Saturday, October 25, 2008 8:09 PM To: statalist@hsphsun2.harvard.edu Subject: st: re: problem using predictnl after obtaining non-linear estimates < > 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: re: problem using predictnl after obtaining non-linear estimates***From:*Kit Baum <baum@bc.edu>

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