Parameters | Expression Parameters | Covariates for Differential Expression

Covariates for Differential Expression
Indicate covariates by which to model differential expression in this field.
To Specify these Covariates:
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To specify interactions between effect, type an asterisk (*) between the covariates. For example, typing A B A*B specifies variables A and B, and the interaction between A and B, as effects.
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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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