On Sep 21, 2010, at 2:47 PM, kurt_h...@nps.gov wrote:
> All
> Is there a script in R equivalent to the "if then" transforms one can
> perform in Systat? For example, I want to create a "Treatment" column
> coded either 1 or 2 for twelve field sites in a large data set. Ideally,
> I'd be able to tell R to code sites a-f as 1 and sites g-l as 2.
> Cheers
> Kurt
Something along the lines of:
Treatment <- ifelse(sites %in% c("a", "b", "c", "d", "e", "f"), 1, 2)
should work. See ?"%in%" and ?ifelse
HTH,
Marc Schwartz
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