a c
1 45.2428
1 47.4545
1 29.7526
1 42.8562
2 55.1996
2 78.0556
2 81.985
2 98.4158
2 42.4844
2 46.946
2 65.3748
2 78.0198
3 102.7021
3 124.6119
3 25.0956
3 25.809
3 45.1011
3 49.5953
4 52.6729
4 53.3321
4 19.159
4 42.6995
问题是,现在我想再加入一列数据b,按照a列中每一类的个数,加入1,2,3,4;即数据变成三列:如下:
a b c
1 1 45.2428
1 2 47.4545
1 3 29.7526
1 4 42.8562
2 1 55.1996
2 2 78.0556
2 3 81.985
2 4 98.4158
2 5 42.4844
2 6 46.946
2 7 65.3748
2 8 78.0198
3 1 102.7021
3 2 124.6119
3 3 25.0956
3 4 25.809
3 5 45.1011
3 6 49.5953
4 1 52.6729
4 2 53.3321
4 3 19.159
4 4 42.6995
不知该如何在SAS中实现?请指点啊!



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