怎样计算多变量的累加频数?如R1可取1,2,3三种
R2可取1,2,3三种。
R3可取1,2,3三种
这样R1,R2,R3的组合有3*3*3共27种了
怎样计算这27种组合的频数呢?
期望结果如下
r1 | r2 | r3 | num |
1 | 1 | 1 | 23 |
1 | 1 | 2 | 46 |
1 | 1 | 3 | |
1 | 2 | 1 | |
1 | 2 | 2 | |
1 | 2 | 3 | |
1 | 3 | 1 | |
1 | 3 | 2 | |
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原始数据格式如下:
ID | R1 | R2 | R3 |
10001 | 1 | 1 | 2 |
10002 | 1 | 2 | 2 |
10003 | 1 | 1 | 2 |
10011 | 1 | 1 | 2 |
10012 | 1 | 1 | 3 |
10013 | 1 | 1 | 2 |
10021 | 1 | 1 | 2 |
10022 | 1 | 1 | 2 |
10023 | 1 | 1 | 2 |
10031 | 1 | 1 | 2 |
10032 | 1 | 2 | 2 |
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