If the argument to the function you
give in the 'by' call were 'z' instead
of 'x', then it would have been easier
to see what was wrong.
You are using 'xx' inside the function
rather than 'x'. I think you want
something like:
function(z) {cor(z$Data1.MEAN,
z$Data2.MEAN)}
Pat
On 27/07/2014
Hello all,
I strongly believe, that my issue is quite easy to resolve. However, I have
no idea how to find/debug what is wrong and I would blame myself for
insufficient knowledge about data tables and some useful functions in R! as
apply, sapply, lapply.
My question is as follows:
I would like t
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