Hi everybody

Sorry guys, please ignore my previous email regarding the problem I was
having using the 'by' function with FUN=mean.  Just read the given error
properly and realised my (silly) mistake in that you can no longer apply
the mean function to a dataframe regardless of whether its wrapped within
'by' or not, as its depreciated in this context -  I'm obviously a bit too
ready for the weekend!!  ;-)

Cheers,
Carina

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