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From |
"josemaria" <jmpsouza@usp.br> |

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

Subject |
Re: st: nonlinear growth curve in xtmixed |

Date |
Fri, 12 Dec 2008 21:29:27 -0200 |

Dear Stas and Maarten:

José Maria By the way, I am not able to write anything in Mata! Jose Maria Pacheco de Souza, Professor Titular (aposentado) Departamento de Epidemiologia/Faculdade de Saude Publica, USP Av. Dr. Arnaldo, 715 01246-904 - S. Paulo/SP - Brasil fones (11)3061-7747; (11)3768-8612 fax (11)3714-2403 www.fsp.usp.br/~jmpsouza

To: <statalist@hsphsun2.harvard.edu> Sent: Friday, December 12, 2008 6:54 PM Subject: Re: st: nonlinear growth curve in xtmixed

As of version 10, Stata provides -xtmelogit- and -xtmepoisson- for logistic and Poisson models, respectively. I believe Singer & Willett only talk about logistic models there, right? You can say those are nonlinear models since the mean functions are nonlinear in x's; to me those are extensions of generalized linear model, and hence there is at least some linear flavor to them. PROC NLMIXED can fit some crazy models with direct integration of the random effects (as far as I know), and full functionality of that is not available in Stata (at least in the easily available commands; you can write anything you want in Mata!) On 12/12/08, josemaria <jmpsouza@usp.br> wrote:Dear Statalisters: Judith D. Singer and John B. Willet, in their book "Applied Longitudinal Analysis", Oxford University Press, 2003, present, in pages 225-232, analysis for nonlinear growth curve using the PROC NLMIXED of SAS, and explain that, at the time of writing the book, Stata did not have yet the same capability. This is also informed at the end of the page: "Stata Textbook Examples Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence by Judith D. Singer and John B. Willett Chapter 6: Modeling Discontinuous and Nonlinear Change", site http://www.ats.ucla.edu/stat/stata/examples/alda/chapter6 : "Table 6.6 on page 231.* Skipped these for now. Stata does not yet do nonlinear mixed models."Isit possible now to do such analysis in Stata? Than you for any orientation. José Maria Jose Maria Pacheco de Souza, Professor Titular (aposentado) Departamento de Epidemiologia/Faculdade de Saude Publica, USP Av. Dr. Arnaldo, 715 01246-904 - S. Paulo/SP - Brasil fones (11)3061-7747; (11)3768-8612 fax (11)3714-2403 www.fsp.usp.br/~jmpsouza * * 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/-- Stas Kolenikov, also found at http://stas.kolenikov.name Small print: I use this email account for mailing lists only. * * 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: nonlinear growth curve in xtmixed***From:*David Airey <david.airey@vanderbilt.edu>

**References**:**st: pwcorr(2)***From:*Kit Baum <baum@bc.edu>

**st: nonlinear growth curve in xtmixed***From:*"josemaria" <jmpsouza@usp.br>

**Re: st: nonlinear growth curve in xtmixed***From:*"Stas Kolenikov" <skolenik@gmail.com>

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