The GLMPOWER Procedure
Specifying Value Lists in the POWER Statement
To specify one or more scenarios for an analysis parameter (or set of parameters) in the POWER statement, you provide a list of values for the option that corresponds to the parameter(s). To identify the parameter you want to solve for, you place a missing value in the appropriate list.
Scenarios for scalar-valued parameters, such as power, are represented by a number-list.