The VAR statement specifies the analysis variables and their order in the results. By default, if you omit the VAR statement, PROC UNIVARIATE analyzes all numeric variables that are not listed in the other statements.
You must provide a VAR statement when you use an OUTPUT statement. To store the same statistic for several analysis variables in the OUT= data set, you specify a list of names in the OUTPUT statement. PROC UNIVARIATE makes a one-to-one correspondence between the order of the analysis variables in the VAR statement and the list of names that follow a statistic keyword.