Dear list,

i try to do my first statistics with R.

Given a dataframe of three columns, where col1 is of type factor, col 2 and 
col3 are numeric and pairs of observations i would like to perform a paired 
t-test for each level of col1.
I would like to avoid specifying the levels of col1 manually because it 
seems to me as being stupid, however, i did not figure out how to tell it R 
in an function. I tried with tapply, but it did not work.

Thanks, Henning    
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