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I have an experiment where a component is stressed (nominally to the same
level) and the stress measured a constant time afterwards for 5 different
materials. I wanted to investigate the effect of material on the difference
in stress giving me the simple model:
anova diff system
The problem is that the initial nominal stress is not constant and may have
en effect on diff.
How can do I formulate this model? I tried
anova diff f1, continuous(f1) but f1 now enters the model as a both a main
factor and a component of diff.
I am using Stata 9.
Many thanks.
Paul
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