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st: Categorical variable codings


From   "Silwood, Christopher J" <silwoocj@lsbu.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Categorical variable codings
Date   Thu, 19 Oct 2006 12:38:56 +0100

Hi,
I am trying various regression analyses on data obtained from the
study of 6 different cooking oils, control and 4 different material
treatments, all samples being sampled at 30 min, 60 min and 90 min
heating. I am wondering what a suitable set of categorical variable
codes to use for comparing, e.g. material/time or oil/material/time,
i.e. 5 X 3 or 6 X 5 X 3 at all levels and interactions, assuming with
the latter that "oil" can be included as an independent variable.

Thanks



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