如何剔除极端值

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如题，请教如何剔除1%分位数以下和99%分位数以上的值，如剔除全校各个专业各个班级成绩最好和最差的学生（先分组再剔除）？

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关键词：极端值 分位数 如何 专业 最好

Here is a one to show you the ideas. There are many ways to solve your problem.

data t1;
do id=1 to 20;
   x=ranuni(1223);
    output;
end;
run;

proc means data=t1 mean median;
  var x ;
  output out=exval p1=p1 p99=p99;
run;

proc sql;
  create table t2 as
  select a.* from t1 as a
  where a.x > ( select p1 from exval) and a.x < ( select p99 from exval)
  ;
  quit;


proc print data=t2;
run;

bobguy 发表于 2012-4-29 21:13
Here is a one to show you the ideas. There are many ways to solve your problem.

data t1;

Thanks, Your idea makes me clear about this probem and known the importance of proc means

很不错呀

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