The SAS data set BANKS is listed below:
BANKS
name rate
FirstCapital 0.0718
DirectBank 0.0721
VirtualDirect 0.0728
The following SAS program is submitted:
data newbank;
do year = 1 to 3;
set banks;
capital + 5000;
end;
run;
Which one of the following represents how many observations and variables
will exist in the SAS data set NEWBANK?
A. 0 observations and 0 variables
B. 1 observations and 4 variables
C. 3 observations and 3 variables
D. 9 observations and 2 variables
Answer: B

如果把 set banks 放到do year=1 to 3前面的话就是3 observations and 4
variables

为什莫呢？谢谢