[R] Importing Data for a two sample t-test

Peter Ehlers ehlers at ucalgary.ca
Thu Nov 15 19:36:06 CET 2012


On 2012-11-14 20:52, nilsonern wrote:
> I am trying to do a two sample t-test with data that i received in a text
> document.  one list has the slab weights and the second has the company it
> is associated with.  here is an example.
>
> weights  company
> 1                  A
> 2                  A
> 2                  B
> 3                  B
>
> I was able to import the data but i cannot figure out how separate the data.
> I want to put them in two separate sets, one being A and one being B.  Any
> help would be appreciated.  Thanks.
>

Why separate? The 'long' form is generally preferred in
statistical analyses.
Just use the formula version of t.test().

Peter Ehlers

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