数据结构如下:
列V1 和V2 总是同时有数据, 列V3和V4也是总是同时有数据。
想在SAS中实现如下功能:
从第一块红色数据开始, V1 和V2同时有数据时,group_id 自动生成1
然后到了第二块蓝色数据, V3和V4同时有数据时,group_id 自动生成2
以此类推, 3, 4, 5 ....
请问如何自动生成这样的列数据?
| id | Name | Sale | V1 | V2 | V3 | V4 | group_id |
1 | a | 1.65 | 0 | 1 | | | 1 |
2 | a | 1.66 | 0 | 1 | | | 1 |
3 | a | 1.66 | 0 | 1 | | | 1 |
4 | a | 1.66 | 1 | 0 | | | 1 |
5 | a | 1.65 | 1 | 0 | | | 1 |
6 | a | 1.65 | 1 | 0 | | | 1 |
7 | a | 1.65 | 1 | 0 | | | 1 |
8 | a | 1.53 | | | | | |
9 | a | 1.5 | | | 1 | 0 | 2 |
10 | a | 1.64 | | | 1 | 0 | 2 |
11 | a | 1.66 | | | 0 | 1 | 2 |
12 | a | 1.66 | | | 0 | 1 | 2 |
13 | a | 1.66 | 0 | 1 | | | 3 |
14 | a | 1.28 | 0 | 1 | | | 3 |
15 | a | 1.28 | 1 | 0 | | | 3 |
16 | a | 1.27 | 1 | 0 | | | 3 |
17 | a | 1.27 | 1 | 0 | | | 3 |
18 | a | 1.26 | | | | | |
19 | a | 1.25 | | | | | |
20 | a | 1.25 | | | | | |
21 | a | 1.26 | | | | | |
22 | a | 1.25 | | | 1 | 0 | 4 |
23 | a | 1.26 | | | 1 | 0 | 4 |
24 | a | 1.26 | | | 1 | 0 | 4 |
25 | a | 1.26 | | | 0 | 1 | 4 |
26 | a | 1.26 | | | 0 | 1 | 4 |
27 | a | 1 | | | | | |
28 | a | 2 | | | | | |
29 | a | 1.27 | 0 | 1 | | | 5 |
30 | a | 1.25 | 0 | 1 | | | 5 |
31 | a | 1.25 | 1 | 0 | | | 5 |
32 | a | 1.25 | 1 | 0 | | | 5 |