In the DATA step provided, average is calculated using the mean function, which calculates the average of the non-missing values of the variables listed. The variables provided are:
var1 = 2
var2 = 4
var3 = .
var4 = 6
The mean function in SAS ignores missing values, represented by a period (.). Hence, the average is computed using the non-missing values (2, 4, and 6). The mean of these three numbers is calculated as: (2 + 4 + 6) / 3 = 12 / 3 = 4
Therefore, the value of average is 4.
References:
SAS documentation on the MEAN function, SAS Institute.
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