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given answer B is correct, .. the code is interleaving one data set (sorting effect) and the if statement is removing the second observation "1 A 33" as it is the second one (not FIRST.Y) for the variable Y.
data one;
infile datalines;
input x y $ z;
datalines;
1 A 27
1 A 33
1 B 45
2 A 52
2 B 69
3 B 70
4 A 82
4 C 91
;
data two;
set one;
by X Y;
if first.Y;
run;
proc print data=two noobs;
run;
upvoted 1 times
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mhminkov
2 years, 10 months ago