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When you add a boolean variable to the Filter pane, the right side of the pane enables you to define a condition based on the selected variable.
► Select the option from the drop-down list box that you want to apply:
• is true. Select this option if you want to include cases for which the value is True.
• is false. Select this option if you want to include cases for which the value is False.
• has a value. Select this option to include cases where a value exists for the selected variable.
• has no value. Select this option to include cases where there is no value for the selected variable. This includes cases where a particular survey question was skipped, for example.