How to generate a new factor variable by two other factor variables?
For example, if I have two factor variables, factorA and factorB,
factorA factorB
0 0
0 0
1 0
0 1
1 1
Is there a simple way to generate a new 4-levels factor variable as
factorC factorA factorB
0 0 0
0 0 0
1 1 0
2 0 1
3 1 1
--
Shuguang Sun
Fudan University, China
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