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st: Problems with defining varable interactions in ANOVA


From   "Rom Litwin" <rom.litwin@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Problems with defining varable interactions in ANOVA
Date   Fri, 7 Jan 2011 13:52:02 +0100

Greetings,

I am super-new to STATA. I am running STATA 11 in Win7 and - contrary to
what most STATA manuals claim, it seems - I am unable to set up interaction
variables in ANOVA. Just to use an example from the UCLA manual, when I run:

. use http://www.ats.ucla.edu/stat/stata/faq/crf24
. anova y a b a*b

I am getting the following error:
variable a*b not found
r(111);

Thank you for your advice.

- Rom Litwin

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