...concrete.

This is about as concrete as an example can get!

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...squares

Texts differ on how expected mean squares are derived, and your favorite one may not agree with what is shown. The most common choices are the ``unrestricted model'' and the ``restricted model.'' These are not actually different models, just different hypotheses. Currently, only the unrestricted ``model'' is supported; see the theory section for more details.

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...1;

With 1 rep, we have something a lot like a randomized complete-block design--although the randomization is different.

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