A Data Analyst is building a dashboard and wants to allow users to select which...

A Parameter action is designed to let users change a parameter value through direct interaction with a visualization. The parameter can then drive a calculated field that determines which measure—such as Sales, Profit, Quantity, or another metric—is displayed on the chart. Tableau ' s current action framework explicitly includes Change Parameter as an action type and notes that parameter actions can be used with calculations to customize how data is displayed. A Set action changes membership in a set, a Highlight action emphasizes selected marks without changing the metric being displayed, and a Filter action restricts the data shown in the target view. Because the requirement is to let the user dynamically select the measure displayed rather than filter or highlight records, the appropriate action type is Parameter .