Use this text box to specify variables to use as additional effects beside the corresponding data values from the tall Input SAS Data Set in the model .
To specify interactions between effect, 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 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 .