libname LogReg  'c:\kurssit\LogReg01\DataPA';
DATA LogReg.afqt;
  INPUT white old faed ed count;
  DATALINES;
1  0  1  1   39
1  0  1  2   29
1  0  1  3    8
1  0  2  1    4
1  0  2  2    8
1  0  2  3    1
1  0  3  1   11
1  0  3  2    9
1  0  3  3    6
1  0  4  1   48
1  0  4  2   17
1  0  4  3    8
1  1  1  1  231
1  1  1  2  115
1  1  1  3   51
1  1  2  1   17
1  1  2  2   21
1  1  2  3   13
1  1  3  1   18
1  1  3  2   28
1  1  3  3   45
1  1  4  1  197
1  1  4  2  111
1  1  4  3   35
0  0  1  1   19
0  0  1  2   40
0  0  1  3   19
0  0  2  1    5
0  0  2  2   17
0  0  2  3    7
0  0  3  1    2
0  0  3  2   14
0  0  3  3    3
0  0  4  1   49
0  0  4  2   79
0  0  4  3   24
0  1  1  1  110
0  1  1  2  133
0  1  1  3  103
0  1  2  1   18
0  1  2  2   38
0  1  2  3   25
0  1  3  1   11
0  1  3  2   25
0  1  3  3   18
0  1  4  1  178
0  1  4  2  206
0  1  4  3   81
DATA first;
  SET LogReg.afqt;
  stage=1;
  advance = ed GE 2;
RUN;
DATA second;
  SET LogReg.afqt;
  stage=2;
  IF ed=1 THEN DELETE;
  advance = ed EQ 3;
RUN;
DATA concat;
  SET first second;
RUN;