[R] merge 2 data frame based on more than 2 variables

From: Wensui Liu <liuwensui_at_gmail.com>
Date: Tue 15 Aug 2006 - 12:43:52 EST


Dear Lister,

I understand merge() can be used to join 2 data frames based on 1 variable. But how about merge based on more than 2 variables?

Thank you so much!

-- 
WenSui Liu
(http://spaces.msn.com/statcompute/blog)
Senior Decision Support Analyst
Health Policy and Clinical Effectiveness
Cincinnati Children Hospital Medical Center

	[[alternative HTML version deleted]]

______________________________________________
R-help@stat.math.ethz.ch 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.
Received on Tue Aug 15 13:00:19 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Tue 15 Aug 2006 - 14:23:11 EST.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.