[R] Selecting groups with R
john.woodard at wayne.edu
Sat Aug 22 01:03:27 CEST 2009
David Winsemius wrote:
> t.test expects two numeric vectors, not a numeric vector and a
> grouping indicator.
> > t.test(dataset[dataset$Color=="RED", "Score"], dataset[dataset
> $Color=="WHITE", "Score"] )
Thank you again, David! I also just realized I could have replaced the
comma with a tilde, as in
t.test(Score~Color). What a difference a character makes!
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