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RE: st: Anova and Contrasts with missing cells


From   "Steichen, Thomas J." <SteichT@RJRT.com>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Anova and Contrasts with missing cells
Date   Tue, 28 Oct 2008 08:56:43 -0400

David,

The question was not one that concerned an alternative denominator error term (Higbee addresses how to use something other than residual error as the denominator). Rather, it was how to specify the numerator term using nested notation rather than crossed notation. My speculation is that the similarity in these two issues is that -test- (which underlies -lincom-) simply does not have the capability to do either (and there is nothing wrong with that except that neither is explicitly eliminated by the documentation, so we waste time trying).

Perhaps of some interest to this list is a couple of posts by Bill Gould on the Ed-stat list from back in 1994. In these, he defends Statistica (<--not a typo) for seemingly providing a "wrong" answer to a problem much like I presented. You'll note that he had well established his informative presentation style even then and that his message explains the underlying issues in my problem.

http://www.math.yorku.ca/Who/Faculty/Monette/Ed-stat/0043.html

http://www.math.yorku.ca/Who/Faculty/Monette/Ed-stat/0047.html

This third post acknowledges two typos in his earlier posts.

http://www.math.yorku.ca/Who/Faculty/Monette/Ed-stat/0048.html

Tom

-----------------------------------
Thomas J. Steichen
steicht@rjrt.com
-----------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of David Airey
Sent: Monday, October 27, 2008 2:32 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Anova and Contrasts with missing cells

I remember the issue of an alternate error term coming up before when
using ANOVA.

Ken Higbee's posted:

http://www.stata.com/statalist/archive/2007-07/msg00475.html

-Dave

On Oct 27, 2008, at 12:30 PM, Steichen, Thomas J. wrote:

> My question: Is there a way to directly specify a nested term in -
> test- or -lincom- using nested notation (i.e., of the form: a|b)? If
> there is, I haven't found it.

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