[R] Selecting groups with R

[jlwoodard]

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!

John
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