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From |
"Frederick J. Boehmke" <frederick-boehmke@uiowa.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Basic regression interaction term question |

Date |
Sun, 12 Oct 2008 18:21:24 -0500 (CDT) |

Description

On Fri, 10 Oct 2008, Michael I. Lichter wrote:

Date: Fri, 10 Oct 2008 13:53:11 -0400 From: Michael I. Lichter <mlichter@buffalo.edu> Reply-To: statalist@hsphsun2.harvard.edu To: statalist@hsphsun2.harvard.edu Subject: st: Basic regression interaction term questionThis is a pretty basic question, but I haven't been able to find any examplesin the lit with this particular configuration ...Suppose you regress Y on A and B, and you expect an interaction between A andB.In the regression Y = A + B, the coefficient for B is not significant, butyou have reason to think that it will be significant once you introduce theinteraction term.However, in the regression Y = A + B + AB, the coefficient for B remainsnon-significant even though the coefficient for AB is significant. Yet, "testA B AB" is significant.Is it reasonable to treat this as a significant interaction? What if AB is not significant either but "test A B AB" is still significant? Michael * * 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/

- Fred < ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Frederick J. Boehmke < Associate Professor of Political Science > University of Iowa < > 308 Schaeffer < 319-335-2342 > http://www.fredboehmke.net ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ * * 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: Basic regression interaction term question***From:*"Michael I. Lichter" <mlichter@buffalo.edu>

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