[求助]a question about do loop

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 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

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关键词：question About Quest loop Bout question loop

I have verified the answer.

- When 'set banks' is put after the do-loop, the loop repeats for each observation of newbank. B/C newbank is new one, therefore, there would be only one observation;
- When 'set banks' is put before the do-loop, the loop repeats for each observation of banks. B/C banks has three observations, therefore, there would be 3 observations;

In both cases, the extra variable is 'Year'.

Hope it helps