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2011 Feb 14
3
help with aggregate()
Hi,
I am trying to aggregate some data and I am confused by the results.
I load a data frame "all" from a csv file, and then I do:
(FOO,BAR,X,Y come from the header line in the csv file,
BTW, how do I rename a column?)
byFOO <- aggregate(list(all$BAR,all$QUUX,all$X/all$Y),
by = list(FOO=all$FOO),
FUN = mean);
I expect a data frame with 4 columns: FOO,BAR,QUUX and X/Y with all FOO
being different (they are character strings, do I need a special
incantation to turn them into...