Hi Folks,
I'm trying to cut my data inside the summaryBy function. Perhaps
formulas don't work that way? I'd like to avoid adding another column
if possible, but if I have to, I have to. Any ideas?
Thanks,
Allie
require(doBy)
df = dataframe(a <- rnorm(100), b <-rnorm(100))
summaryBy(a ~ cut(b,c(-100,-1,1,100)), data=df) # preferred
solution, but it throws an error
# Error in
`[.data.frame`(data, , rh.var, drop = FALSE) : undefined columns selected
df$c = cut(b,c(-100,-1,1,100))
summaryBy(a ~ c, data=df) # works fine
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