Given the SAS data set WORK.ONE:
| Obs | Revenue2008 | Revenue2009 | Revenue2010 |
| 1 | 1.2 | 1.6 | 2 |
The following SAS program is submitted:
data WORK.TWO;
set WORK.ONE;
Total=mean(of Rev:);
run;
What value will SAS assign to Total?
A. 3
B. 1.6
C. 4.8
D. The program fails to execute due to errors.
Answer: B
注解：本题使用了Variable List，Rev:是指选取所有以Rev开头的变量，并且在对变量列使用function时，要在变量列之前加上OF。mean(of Rev:)等价于 mean(Revenue2008, Revenue2009, Revenue2010)，MEAN function用于求这三个值的均值。