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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Interaction term with categorical variables and no. of observations stepwise regressions |
| Date | Wed, 1 Aug 2012 15:01:50 +0200 |
On Wed, Aug 1, 2012 at 2:03 PM, Marcel Steinter wrote: > Do you have an opinion to let the main effects included? Found that there is no conclusiojn across forums. Leaving the main effects out of a model drastically changes the interpretation of the results. So if you leave the main effects out you need to be really careful. See e.g.: M.L. Buis (2012) "Stata tip 106: With or without reference", The Stata Journal, 12(1), pp. 162-164. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/