数学之路-sas备忘(12)

data student1;
input name$ age score;
datalines;
wangwu 29 68
lisi 30 85
wangxi 28 79
lixingxun 32 91
wufang 27 56
;
run;
data student;
set student1;
run;
data student2;
input name$ age score;
datalines;
wangwu 29 88
lisi 30 89
wangxi 28 85
lixingxun 32 93
wufang 27 76
;
run;
/*显示原数据集*/
proc print data=student;
title "原数据集";
run;
/*remove移除观测*/
data student1;
modify student1;
if score <80 then  remove;
run;
proc print data=student1;
title "remove";
run;
/*replace替换观测*/
data student;
modify student student2;
by name;
if score >85 then  replace;
run;
proc print data=student;
title "replace";

run;

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