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From |
Cameron McIntosh <cnm100@hotmail.com> |

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

Subject |
RE: st: Negative binomial regression (nbreg): Plot an interaction effect of two continuous/interval variables |

Date |
Sat, 10 Sep 2011 12:06:27 -0400 |

Fred, I don't know if -1SD and +1SD are always the best values to use. I would recommend also trying a range of more "interesting/meaningful" values of your moderator to generate predicted probabilities for plotting. You should also take a look at these papers: Buis, M.L. (2010). Stata tip 87: Interpretation of interactions in non-linear models. The Stata Journal, 10(2), 305-308. Norton, E.C., Wang, H., & Ai, C. (2004). Computing interaction effects and standard errors in logit and probit models. The Stata Joumal, 4(2), 154-167.http://www.unc.edu/~enorton/NortonWangAi.pdf Ai, C., & Norton, E. C. (2003). Interaction terms in logit and probit models. Economic Letters, 80, 123-129. Hayes, A.F., & Matthes, J. (2009). Computational procedures for probing interactions in OLS and logistic regression: SPSS and SAS implementations. Behavior Research Methods, 41, 924-936. http://www.personal.psu.edu/jxb14/M554/articles/Hayes&Matthes2009.pdf Francoeur, R.B. (2011). Interpreting interactions of ordinal or continuous variables in moderated regression using the zero slope comparison: tutorial, new extensions, and cancer symptom applications.International Journal of Society Systems Science, 3(1/2), 137-158. Cam > Date: Sat, 10 Sep 2011 17:35:53 +0200 > Subject: st: Negative binomial regression (nbreg): Plot an interaction effect of two continuous/interval variables > From: statalistrequest@googlemail.com > To: statalist@hsphsun2.harvard.edu > > Dear users of statalist, > > I have a nbreg model containing 3 continuous variables and one interaction > effect of two of these variables. > > How can I get a judicious plot of the interaction effect? A common method > for plotting interactions effets in general is a graph, where one uses > predications for -SD Mean +SD of both variables. > > How can I do that or another valuable plot in stata for nbreg? Or how can I > use prvalue to calculate the needed values to put these data somehow in > excel? > > Your kind help is highly appreciated. > > Fred > * > * 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: Negative binomial regression (nbreg): Plot an interaction effect of two continuous/interval variables***From:*S Statistic <statalistrequest@googlemail.com>

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