What does the 'HISTOGRAM' statement require in PROC UNIVARIATE?

The 'HISTOGRAM' statement in PROC UNIVARIATE is designed to create a graphical representation of the distribution of a specified variable. The fundamental requirement for this statement is to indicate the variable you wish to analyze. By specifying the variable, the procedure can generate the histogram that reflects the frequency distribution of the data associated with that variable.

While other elements like group identifiers or summary statistics can enhance the output or provide additional context, they are not necessary for the basic functionality of creating a histogram. The primary focus of the statement revolves around the variable to be analyzed, as it forms the foundation upon which the histogram is built. Consequently, understanding how to properly use the HISTOGRAM statement with the correct variable is essential for effective data visualization in PROC UNIVARIATE.