如何在一个数据集中插入观测？谢谢！

shiyiming

给个例子，你可以尝试一下：
[code:dvcm71vp]data class;
set sashelp.class;
if _n_<16 then id=_n_;
else id=_n_+1;
run;

data a;
set sashelp.class;
if _n_=10;
name='I';
id=16;
run;

data b(drop=id);
update class a;
by id;
run;[/code:dvcm71vp]