Parameters | Workflows | Principal Variance Component Effects for QC

Effects typically contain one or more categorical variables, which must also be specified in the Categorical Variables for Model field.

To specify interactions between effect, type an asterisk (*) between the effects. For example, assuming A and B are listed as Categorical Variables, typing A B A*B specifies variables A and B, and the interaction between A and B, as effects.

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.