- data test;
- input obs month p;
- cards;
- 1 1 0.2
- 1 2 0.3
- 1 3 0.2
- 1 4 0.5
- 2 1 0.3
- 2 4 0.5
- 3 2 0.6
- 3 3 0.7
- 3 4 0.8
- 3 6 0.5
- ;
- run;
obs month p new
1 1 0.2 0
1 2 0.3 0.1=0.3-0.2
1 3 0.4 0.2=0.4-0.2
1 4 0.5
2 1 0.3 0
2 4 0.5 0.2=0.5-0.3
3 2 0.6 0
3 3 0.7 0.1=0.7-0.6
3 4 0.8 0.2=0.8-0.6
3 6 0.5 -0.1=0.5-0.6



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