求助如何构造有缺失数据的数据集

shiyiming

我现在有一个完整的数据集，想通过编程，实现对该完整数据集构造具有不同缺失率（比如10％、20％）的随机缺失数据集，请问如何编程实现呢？

shiyiming

[code:3oie9llr]
data ads;
do i=1 to 100;
   j=2*i;
   output;
end;
run;

proc surveyselect data=ads
  method =srs
  rep=1
  sampsize=10
  seed=12345
  out=bds;
  id i;
run;

proc sql noprint;

create table cds as
select *
from ads
where i not in
(select i from bds);

quit;

data bds;
set bds;
j=.;
run;

data dds;
set cds bds;
run;

data eds;
set dds;
drop i;
run;

[/code:3oie9llr]