Right you are, Elliot.
However, when one finds "no-interaction" among all of those cells
that are present, then one can feel "better" about estimating
the "missing" cell values. Of course, there could be a surprising
explosion!! The more interaction that is detected the more dangerous it can
be.
When there is little or no interaction it is possible to design the study
to save money and time. There is no need to fill in all the cells all the
time -- particularly when the cost is great.
The real experimental design "experts" can get lots of information from
a small study that might have missing cells "strategically located".
- Joe
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Joe Ward.........................................Health Careers High School
167 East Arrowhead Dr....................4646 Hamilton Wolfe
San Antonio, TX 78228-2402...........San Antonio, TX 78229
Phone: 210-433-6575.......................Phone: 210-617-5400
Fax: 210-433-2828............................Fax: 210-617-5423
Email: [EMAIL PROTECTED]
http://www.ijoa.org/joeward/wardindex.html
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----- Original Message -----
From: "Elliot Cramer" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, November 01, 2000 8:43 PM
Subject: Re: 2 factor ANOVA with empty cells
> Jeff E. Houlahan <[EMAIL PROTECTED]> wrote:
> : Is it ever appropriate to do a 2-factor unreplicated ANOVA with
> : empty cells if you aren't sure there is no interaction between the
> ^
> you can test the part of the interaction that is testable, but of course
> you can never know about the rest.
>
>
>
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