[R] merge 2 data frame based on more than 2 variables
liuwensui at gmail.com
Tue Aug 15 05:18:59 CEST 2006
what if the names are different in 2 data frames?
On 8/14/06, Simon Blomberg <blomsp at ozemail.com.au> wrote:
> Wensui Liu wrote:
> > 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!
> Just specify the 2 (or more) variable names in a column vector for "by")
> merge(dat1, dat2, by= c("VarA", "VarB"))
> assuming both data frames have columns VarA and VarB.
> Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat.
> Centre for Resource and Environmental Studies
> The Australian National University
> Canberra ACT 0200
> T: +61 2 6125 7800 email: Simon.Blomberg_at_anu.edu.au
> F: +61 2 6125 0757
> CRICOS Provider # 00120C
Senior Decision Support Analyst
Health Policy and Clinical Effectiveness
Cincinnati Children Hospital Medical Center
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