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If you specify more than one effect, then you must separate the effects with spaces. For example, assuming A and B are listed as Class Variables, typing A B in the text field specifies variables A and B as main fixed effects.
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To specify interactions between effects, type an asterisk (*) between the effects. For example, assuming A and B are listed as Class Variables, typing A B A*B specifies variables A and B, and the interaction between A and B as effects (a two-way ANOVA model).
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A vertical bar (|) can be used to create main effects and interactions. For example, typing A|B is the same as typing A B A*B.
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An at-sign (@) can be used to limit the number of interactions. For example, typing A|B|C@2 removes the three-way interaction term.
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