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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Intepretation of interaction terms |

Date |
Mon, 23 May 2011 14:51:45 +0200 |

On Mon, May 23, 2011 at 2:33 PM, lreine ycenna <lreine.ycenna@gmail.com> wrote: > If I understood correctly, you saying that the interpretation of a, b, > and c are the same both in (1) and (2)? > e.g. a is the effect of a, when the other variables =0. b is the > effect of b, when others =0. axb is the effect of both a and b when c > =0...etc. No, the coefficient of b is the effect of b when a = 0 (regardles of the value the variable c takes). The the coefficient of c folows a similar rule. But the coefficient of a is the effect of a when both b and c are 0. Do not try to turn these into general rules. The only way to interpret more complicated interaction effects is to write them out. Do not be tempted to create rules or do this without the aid of writing your equation down and deriving the effects, that will always go wrong. In my previous post I gave examples on how to write your equations down and derive the effects. The mathematics is not hard, it is just a matter of proper "book keeping", that is what you need the paper and pen for. 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/

**References**:**st: Intepretation of interaction terms***From:*lreine ycenna <lreine.ycenna@gmail.com>

**Re: st: Intepretation of interaction terms***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: Intepretation of interaction terms***From:*lreine ycenna <lreine.ycenna@gmail.com>

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