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From |
Maarten buis <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Poisson model with interaction term |

Date |
Tue, 26 Feb 2008 07:45:03 +0000 (GMT) |

The formulas can be found in section 2.3 here: http://www.unc.edu/%7Eenorton/NortonWangAi.pdf Where in case of a poisson with a standard link function: F(u)=exp(u); f(u)=F'(u)=exp(u); f'(u)=F''(u)=exp(u) Hope this helps, Maarten --- Lloyd Dumont <[email protected]> wrote: > Actually, I am running count models on panel data > using xtpoisson and xtnbreg, but have the exact same > question. (But mine really does include a count as a > dep var.) How do I make sense of the interaction > term? I am fairly sure I cannot just add the > coefficients of main effects and two-way interactions > in this case. I don't even think I can take the > significance of the coefficient on the interaction > term seriously. > > Thanks as always. Lloyd Dumont > --- [email protected] wrote: > > > thank you Maarten, hence I can simply apply the > > linear case formulas... > > > > thanks again > > Maria > > Citazione Maarten buis <[email protected]>: > > > > > --- [email protected] wrote: > > > > I�m estimating a Poisson model, which includes > > an interaction term > > > > and I need to compute the impact (marginal > > effect) of x1 on lnY. > > > > > > > > I have found on SJ an article �Computing > > interaction effects and > > > > standard errors in Logit and Probit models�, by > > Norton, Wang and Ai > > > > (2004), who warn that for nonlinear models > > > <snip> > > > > Please notice that my interest is computing > > the effect of x1 on lnY > > > > , I�m not interested in the marginal effect of > > the interaction term, > > > > nor in the effect of x1 on E(Y), because my > > dependent variable is > > > > not a count. > > > <snip> > > > > > > If you are only interested in the effect on ln(y) > > than it is no longer > > > a non-linear model, so the article by Norton et > > al. is no longer > > > relevant. > > > > > > -- Maarten > > > > > > ----------------------------------------- > > > Maarten L. Buis > > > Department of Social Research Methodology > > > Vrije Universiteit Amsterdam > > > Boelelaan 1081 > > > 1081 HV Amsterdam > > > The Netherlands > > > > > > visiting address: > > > Buitenveldertselaan 3 (Metropolitan), room Z434 > > > > > > +31 20 5986715 > > > > > > http://home.fsw.vu.nl/m.buis/ > > > ----------------------------------------- > > > > > > > > > > > > __________________________________________________________ > > > Sent from Yahoo! Mail. > > > A Smarter Inbox. > > http://uk.docs.yahoo.com/nowyoucan.html > > > * > > > * For searches and help try: > > > * > > http://www.stata.com/support/faqs/res/findit.html > > > * http://www.stata.com/support/statalist/faq > > > * http://www.ats.ucla.edu/stat/stata/ > > > > > > > > > > > > > ------------------------------------------------- > > This mail sent through IMP: http://horde.org/imp/ > > > > * > > * For searches and help try: > > * > > http://www.stata.com/support/faqs/res/findit.html > > * http://www.stata.com/support/statalist/faq > > * http://www.ats.ucla.edu/stat/stata/ > > > > > > > ____________________________________________________________________________________ > Never miss a thing. Make Yahoo your home page. > http://www.yahoo.com/r/hs > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- __________________________________________________________ Sent from Yahoo! Mail. A Smarter Inbox. http://uk.docs.yahoo.com/nowyoucan.html * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Poisson model with interaction term***From:*Maarten buis <[email protected]>

**References**:**Re: st: Poisson model with interaction term***From:*Lloyd Dumont <[email protected]>

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