Hi Gurus:
If I have a large dataset of the form of:
> x <- data.frame(V1 = runif(10), V2 = sample(c('A','B','C'),10,T)) > x
> V1 V21 0.2691580 A2 0.8711267 B3 0.2674728 C4 0.3278876 A5
> 0.1809152 A6 0.2499651 C7 0.9155174 A8 0.8004974 B9 0.7885516 A10
> 0.9301630 A
And I want a V3 that =V2 if V2=A, and =D if V2=B or C. In other words I want to
use a vectorized way to combine some levels, rather than having to loop through
a large dataset.
Similarly, if I want to group V1 into levels, what is a fast way to do it?
Thank you!
Karen
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