1. In Spotfire Analyst, click on Tools>> Statistica to open the Data Function.
2. Select the workspace that is used as Data Function and then click on the pen icon to modify data function definition
3. Select the input/output/parameters tab and select the root node to select all the inputs/outputs/parameters along with all its sub-tree options. To deselect all nodes/parameters, click on the root node twice as shown below :