Parameters | Expression Parameters | Covariates

Covariates
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 .
The (Cox) model fitting will be adjusted for these covariates .
To Specify One or More Covariates:
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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.
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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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