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From |
Richard Williams <Williams.NDA@comcast.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Re-re-post: Stata 11 - Factor variables in a regression command |

Date |
Sat, 01 May 2010 13:59:58 -0500 |

At 12:31 PM 5/1/2010, Michael Norman Mitchell wrote:

If, instead one specifies -a#b-, this term has (A-1) + (B-1) +(A-1)*(B-1) , and is no longer partitioned into main effect of a,main effect of b, and interaction. The omnibus test of this effectis the overall test of the null hypothesis that there issimultaneously no main effect of a, no main effect of b, and no aby b interaction. As I show below, it simply tests the equality ofmeans in all of the cells. I think this is rarely of researchinterest when one has this kind of "factorial" layout.

------------------------------------------- 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/

**References**:**Re-re-post: Stata 11 - Factor variables in a regression command***From:*Ricardo Basurto <ricardobasurto@gmail.com>

**Re: Re-re-post: Stata 11 - Factor variables in a regression command***From:*Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>

**Re: Re-re-post: Stata 11 - Factor variables in a regression command***From:*Richard Williams <Williams.NDA@comcast.net>

**Re: Re-re-post: Stata 11 - Factor variables in a regression command***From:*Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>

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