What is parameter in Tableau?

A parameter in Tableau is a dynamic value that can be used to replace constant values in calculations, filters, and reference lines. Parameters allow users to create interactive dashboards that enable end-users to change certain aspects of the data being displayed without having to modify the underlying data source or the workbook itself. This flexibility empowers users to perform ad-hoc analysis and gain deeper insights from their data.

Parameters can be created for various data types, such as integers, floating-point numbers, dates, strings, and Boolean values. Once a parameter is created, it can be used in calculations by referencing the parameter name. For example, a parameter named ""Discount Threshold"" can be used in a calculation to filter data based on a user-defined discount percentage.

In addition to calculations, parameters can also be used in filters to dynamically control which data is displayed in a visualization. By connecting a parameter to a filter, users can change the filter criteria by adjusting the parameter value, providing a more interactive and intuitive user experience.

Another powerful feature of parameters is their ability to be used in reference lines. Reference lines are visual indicators that help users compare data points against a fixed value, such as an average or a target value. By using parameters in reference lines, users can change the reference value on the fly, allowing for quick and easy comparisons without the need to create multiple reference lines for different scenarios.

Overall, parameters in Tableau provide users with a powerful tool to create dynamic and interactive visualizations that enable deeper insights and more informed decision-making. By leveraging parameters, users can build flexible dashboards that cater to a wide range of analytical needs and empower end-users to explore data in a more interactive and intuitive manner.