如题。代码如下。问题是，如何把新变量stats加入到数据集trystats中？第一次发帖提问，先谢过各位大神！

data trystats;
  infile 'e:\try01.csv' delimiter =',' MISSOVER DSD lrecl=32767;
  format number $6.;
  input number $ ocf icf fcf cf stats $;     
  select;
    when(ocf ge 0 and icf ge 0 and fcf ge 0) put stats='aaa';
        when(ocf ge 0 and icf ge 0 and fcf lt 0) put stats='aab';
        when(ocf ge 0 and icf lt 0 and fcf ge 0) put stats='aba';
        when(ocf ge 0 and icf lt 0 and fcf lt 0) put stats='abb';
        when(ocf lt 0 and icf ge 0 and fcf ge 0) put stats='baa';
        when(ocf lt 0 and icf ge 0 and fcf lt 0) put stats='bab';
        when(ocf lt 0 and icf lt 0 and fcf ge 0) put stats='bba';
        otherwise put stats='bbb';
  end;
run;