The formula builder can be used to modify existing ___________ variables.

The formula builder is a powerful feature within SAS Enterprise Miner that allows users to create and manipulate variables based on existing data. When it comes to modifying variables, the focus is specifically on input variables. Input variables are those that are used by various nodes as predictors or features in modeling processes, such as regression or decision trees.

The formula builder enables users to create derived variables by applying mathematical functions, transformations, or aggregations to existing input variables. This can include operations such as normalization, standardization, or creating interaction terms. By modifying input variables, data scientists can improve the predictive power of their models and better tailor their analyses to the data at hand.

While other types of variables, such as output or analysis variables, play important roles in modeling and assessment, the formula builder specifically targets the adjustments and enhancements of input variables, making them the focal point of this functionality.