[R] summaryBy: transformed variable on RHS of formula?

[Søren Højsgaard]

Sorry, no - you will have to do something like the latter suggestion.

Regards
Søren

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Alexander Shenkin
Sent: 2. april 2012 17:59
To: r-help at r-project.org
Subject: [R] summaryBy: transformed variable on RHS of formula?

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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