A parameter is a global placeholder value such as a number, date, or string that can replace a constant value in a calculation, filter, or reference line.
For example, you may create a calculated field that returns True if Sales is greater than $500,000 and otherwise returns False. You can replace the constant value of "500000" in the formula with a parameter.
Then, using the parameter control, you can dynamically change the threshold in your calculation.
For example -