On Jun 14, 2010, at 10:06 PM, skan wrote:
Hello
Can someone explain me the difference between aggregate and merge,
please?
I've read the help on both commands but I don't understant the
difference.
Merge adds data from one dataframe to another based on a matching
process. Aggregate, which is a wrapper for tapply, works within one
dataframe to apply a chosen function to "like" rows.
--
David.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
