By default, what does PROC FREQ analyze in a SAS data set?

PROC FREQ in SAS is designed to analyze the frequency of values within all available variables in the specified dataset if no particular conditions or restrictions are set. This includes both numeric and character variables. By default, it provides a comprehensive overview, generating a frequency table that summarizes how often each value appears in the dataset. This capability allows users to gain insights into the distribution and occurrence of data points across different variables without having to specify them individually.

Choosing 'all available variables' encapsulates PROC FREQ's functionality of analyzing the entire dataset unless a specific class statement is employed to narrow down the focus to certain variables. This versatility makes PROC FREQ a robust starting tool for exploratory data analysis. When restrictions such as a class statement are not provided, the procedure efficiently covers all aspects of the data set.