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From | Richard Williams <richardwilliams.ndu@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Marginal Effects for Logistic Mulitlevel Model withInteractionTerms |
Date | Mon, 30 Aug 2010 08:34:23 -0500 |
At 04:50 AM 8/30/2010, Maarten buis wrote:
--- On Mon, 30/8/10, Richard Williams wrote: > I notice that, unlike -mfx-, the new -margins- command does > not even report marginal effects for interaction terms, e.g. ... > So, does this mean that marginal effects of interaction > terms are no longer an issue because Stata is now handling > them correctly, blending in the interaction effects with the > main effects? Or, would people still want to (somehow) > compute a marginal effect for the interaction term? ... Those are cases where you want to know the change in effect of one variable (education, parental social class) when another variable changes (gender, time). So in those cases you want some quantification of the size of the interaction effect.
I agree that we want some quantification of the size of interaction effects. But, is the marginal effect of the interaction term no longer even a candidate for that task, since margins does not report it? It seems that marginal effects of interaction terms have gone from being reported (incorrectly?) to not even being reported at all. Which is fine with me, but it seems like there was a lot of concern in the past with getting the mfx of interaction terms reported "correctly" (e.g. there is the -inteff- program at SSC.)
------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * 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/