Re: st: 4-way interactions

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 05:41 PM 7/16/2005 -0700, Bethany & Tom Timmerman wrote:
> Hello all,
> Relatively new user so excuse me if this is a dumb
> question. I know I can use xi3 to test 3 way
> interactions in (logistic) regression. Is it possible
> to test 4-way interactions? I tried it using xi3 and
> it dropped the 4-way.
> Thanks,
> Tom
The help for -xi3- says

"The xi3 command is the same as the xi command, except that it allows 3 way 
interactions, any combination of continuous and categorical variables, and 
performs additional coding schemes beyond indicator coding, and can create 
codings that allow for testing simple contrasts and simple effects.  It's 
syntax is much like the xi command."

So, if you want a 4-way or higher interaction, it sounds like you will have 
to compute the terms yourself.

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Richard Williams, Notre Dame Dept of Sociology
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