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发帖数: 944 | 1 Q12：
%let idcode=Prod567;
which one of the following statements stores the values 567 in the macro
variable CODENUM?
答案是C：
%let codenum=%substr(&idcode, %length(&idcode)-2);
这-2是什么意思？
Q19：
SAS data set TEMP has the following distribution of values for variable A:
A Frequency
1 500,000
2 500,000
6 7,000,000
8 3,000
which one of the following SAS programs requires the least CPU time?
答案是C：
data new;
set temp;
if a=6 then b='Large';
else if a in (1,2) then b='Medium';
else if a=8... 阅读全帖 |
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