请教高手：怎么在数据中删除含缺失值的观测

shiyiming

请教高手：怎么在数据中删除含缺失值的观测
data a;
input x y z@@;
cards;
1 2 3
1 2 2
1 2 .
2 2 1
2 3 5
2 2 8
. 2 1
;
另外，如果x为字符型变量，会不会对删除方法有影响呢？

shiyiming

[code:2bpcobth]data b;
set a;
if x="." or z="." then delete;
proc print;
run;[/code:2bpcobth]

shiyiming

[code:1kh3hod2]data a;
input x $ y z @@;
cards;
1 2 3
1 2 2
1 2 .
2 2 1
2 3 5
2 2 8
. 2 1
;
run;

data b;
set a;
if missing(x) or missing(y) or missing(z) then delete;
run;[/code:1kh3hod2]