[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
Senior Decision Support Analyst
Health Policy and Clinical Effectiveness
Cincinnati Children Hospital Medical Center

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Received on Tue Aug 15 13:00:19 2006

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