Some useful commands are:
by(), aggregate(), ave(), split().
eg
by(market_value, account_id, sum)
-thomas
On Wed, 28 Jan 2009, Rixon, John C. wrote:
Hi folks:
I am a SQL guy who just downloaded and installed R yesterday. I am
trying to evaluate some "complex" aggregations we are currently
performing with Syncsort (and have tried in Oracle) with R. I have
loaded data in a dataframe and have performed some of the simple
aggregations on a subset of data. What I do not see how to do though,
is to "group" the aggregations on a particular key value (e.g., sum
market_value over account_id).
If you can point me in the right direction I'd very much appreciate it.
Thanks!
John
[[alternative HTML version deleted]]
______________________________________________
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.
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
______________________________________________
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.
