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Re: st: Finding xi3
From
Richard Williams <[email protected]>
To
[email protected]
Subject
Re: st: Finding xi3
Date
Tue, 17 Jul 2012 09:57:56 -0500
At 08:40 AM 7/17/2012, Steve Samuels wrote:
-xi3- is an enhanced "interaction-expansion" prefix command,
written by Phil Ender.
The reference is to a 2007 Statalist thread about how to find
-xi3-.
(http://www.stata.com/statalist/archive/2007-03/msg00964.html). For some
reason, -findit- still does not do the job. I just now located -xi3-
by starting
from a search box on the UCLA Academic Technology Services web site.
(http://statistics.ats.ucla.edu/stat/)
-findit- finds it for me. When I click on the link for it, I get
net describe xi3, from(http://www.ats.ucla.edu/stat/stata/ado/analysis)
In Stata 11+, factor variables provide much of the utility of -xi3-. However
-xi3- and the contributed command -desmat- (findit) have capabilities that
have not yet been duplicated in official Stata: options to generate
Helmert and other special coding schemes.
In Stata 12, the new -contrast- command seems to provide much if not
all of the utility provided by -xi3-, including Helmert and reverse
Helmert. See
help contrast
help contrast##operators
I want to thank again Phil Ender and ATS for providing such a wonderful
resource for data analysts.
I agree. Besides programs, UCLA has some very nice tutorials and examples.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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