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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 11:18:09 -0400 |

I have a general question about predictnl and that is does it evaluate any function as in any NL function of the parameters and some explanatory variables or does it only predict dependent variables as is usually done. thanks for letting me know ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kit Baum [baum@bc.edu] Sent: Sunday, October 26, 2008 10:23 AM To: statalist@hsphsun2.harvard.edu Subject: st: re: problem using predictnl after obtaining non-linear estimates <> 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 * * 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/

**Follow-Ups**:**Re: st: RE: re: problem using predictnl after obtaining non-linear estimates***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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

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