What keyword is used to define a new data set in SAS?

In SAS, the keyword used to define a new data set is "DATA." This keyword initiates the DATA step, which is essential for creating a new data set from existing data or inputting new data directly. By using this keyword, you tell SAS that you are beginning a process to generate or manipulate a data set, setting the stage for subsequent statements within that DATA step.

The DATA step can include various operations, such as reading existing data, applying transformations, or creating new variables. Using "DATA," you also specify the name of the new data set you want to create, which is fundamental for organizing and managing your data in SAS.

While other keywords like "NEW," "SET," and "DEFINE" have specific functions within the SAS programming environment, they do not serve the same purpose as "DATA." "SET," for instance, is used to read in an existing data set rather than to create a new one, while "DEFINE" is not a SAS keyword in this context. Therefore, "DATA" is the correct keyword to use when you need to define a new data set in your SAS program.