| Area | Year | Type | Products |
| Place_1 | 1991 | total | 120 |
| Place_1 | 1991 | a | 30 |
| Place_1 | 1991 | b | 90 |
| Place_1 | 1992 | total | 310 |
| Place_1 | 1992 | a | 230 |
| Place_1 | 1992 | b | 80 |
| Place_2 | 1991 | total | 80 |
| Place_2 | 1991 | a | 20 |
| Place_2 | 1991 | b | 60 |
| Place_2 | 1992 | total | 110 |
| Place_2 | 1992 | a | 50 |
| Place_2 | 1992 | b | 60 |
目标是新增一列,算各type占total的比例,如下:
| Area | Year | Type | Products | Portion |
| Place_1 | 1991 | total | 120 | 1 |
| Place_1 | 1991 | a | 30 | 0.25 |
| Place_1 | 1991 | b | 90 | 0.75 |
| Place_1 | 1992 | total | 310 | 1 |
| Place_1 | 1992 | a | 230 | … |
| Place_1 | 1992 | b | 80 | … |
| Place_2 | 1991 | total | 80 | |
| Place_2 | 1991 | a | 20 | |
| Place_2 | 1991 | b | 60 | |
| Place_2 | 1992 | total | 110 | |
| Place_2 | 1992 | a | 50 | |
| Place_2 | 1992 | b | 60 |
不知用SAS该如何实现?如何找到每个place在每一年的total值?
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