|
|
楼主
楼主 |
发表于 2006-9-3 14:02:47
|
只看该作者
Some base SAS problems I met
The base exam is not hard.I just remember the following problems, whish it would be some kind of helpful for the DXJM who are preparing for the base exam.
!)
footnote1 'A';
footnote2 'B';
footnote3 'C';
footnote4 'D';
data ABC ;
footnote2 'CHANGE';
proc print data=ABC;
run;
/*What's the footnote in data ABC*/
2) data A;
x=3;
y=2;
z=x**y;
run;
question:
what's the value for z in data A?
3) data ABC ;
do until (b gt 6);
b+1;
end;
run;
question: What's the value for b stroed in data A?
4)data ABC has five observations;
data B;
set ABC;
do i=2000 to 2020 by 5;
y=x+50;
output;
end;
/* questions:
How many observations are in data B ?*/
5)
data ABC ;
input x: mmddyy10.;
format x weekdate17.;
y=weekday(x); /* Told you that it's saturday*/
cards;
4222000
;
run;
/* questions:
What's the result of x, y*/
6)
data ABC ;
input x;
if x=. then y='missing';
else y=x;
cards;
.
1
;
run;
proc print data=ABC;
run;
/* questions:
What's the possible result of y*/
7) Scan , trim , substr function should know in detail.
<!-- s8) --><img src="{SMILIES_PATH}/icon_cool.gif" alt="8)" title="Cool" /><!-- s8) --> diffrence between 'set A B;' and 'set A; set B;' |
|
