Using the following dataset for illustration:
data test;
input id $ x y;
cards;
a1 1 2
a1 1 4
a1 2 8
a1 2 16
b1 2 2
b1 2 4
b1 2 8
b1 3 16
b1 4 32
;
run;
I'd like to retain all records sharing the lowest values of x by subject id:
id x y
a1 1 2
a1 1 4
b1 2 2
b1 2 4
b1 2 8
There's a simple solution I'm missing -- tried the following code but it didn't work:
data test2;
set test;
by id x;
if first.x;
run;
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