SAS中 數據按兩個變量排序 然後提取出第壹個變量所對應第二個變量的最小值！ 比如說我有十種車，每

data test;

input cars $ price;

datalines;

bmw 30

das 20

bmw 27

das 22

bmw 25

das 18

;

run;

proc sort data=test;

by cars price ;

run;

data need ;

set test;

by cars price;

if first.cars then output;

run;