[R] Multi t tests

[R. Michael Weylandt]

It's usually standard to provide an example of what code you've tried
and also to put your data in a form that can be more easily
cut-and-pasted into R.

That said, would something like this work if you know you only have
two sorts of cross in each level?

lapply(spl, function(x) {x <- split(x[,1],x[,2]); t.test(x[[1]], x[[2]])})

Michael

On Fri, Oct 14, 2011 at 10:38 AM, Imri <bisrael at agri.huji.ac.il> wrote:
> hi all
>
> I have R object look like this:
>> spl
> $SB012XSB044
>    DPW       Cross
> 1  66.6 SB012XSB044
> 2  96.5 SB012XSB044
> 3  78.8 SB012XSB044
> 4  68.6 SB012XSB044
> 5  62.0 SB012XSB044
> 6  72.1 SB044XSB012
> 7  72.2 SB044XSB012
> 8  69.6 SB044XSB012
> 9  87.9 SB044XSB012
> 10 84.4 SB044XSB012
> 11 51.9 SB044XSB012
> 12 65.5 SB044XSB012
>
> $SB012XSB099
>     DPW       Cross
> 13 100.9 SB012XSB099
> 14  44.4 SB012XSB099
> 15  83.5 SB012XSB099
> 16  89.9 SB012XSB099
> 17  78.0 SB012XSB099
> 18  83.0 SB012XSB099
> 19 114.3 SB099XSB012
> 20 173.1 SB099XSB012
> 21 114.3 SB099XSB012
> 22  58.8 SB099XSB012
> 23  98.1 SB099XSB012
> 24  12.8 SB099XSB012
>
> I want to do a t test for DPW values by the 2 different Cross types for each
> of spl components.
> Any suggestions? I just got errors till now
>
> Thanks,
> Imri.
>
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