[R] How to use tapply with more than one variables grouped

[arun]

Hi,

If the criteria is to pick which among the following states are the top 2 contributors for each candidate,
dat1<-read.table(text="

                  AL  AR  CA  NY
Doug    250 250 250  NA
Jennifer  20 340 300 100
Michele  250 500 250  60
Obama    15  45 520 600
",header=TRUE,stringsAsFactors=FALSE,sep="")

#for Obama
apply(dat1,1,function(x,n) x[which(rank(x)>length(x)-n)],n=2)[4]
#$Obama
# CA  NY 
#520 600 

Your question was to list the states where Obama has higher amount received compared to ??

A.K.

 

----- Original Message -----
From: noobmin <pseudovoid at hotmail.com>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, October 23, 2012 7:41 AM
Subject: Re: [R] How to use tapply with more than one variables grouped

I believe that previously could not be understood. To facilitate'll give you
an example. Assuming my table is presented below with the amount received
from each candidate for president in a particular country state.


                   AL  AR  CA  NY
Doug     250 250 250  NA
Jennifer  20 340 300 100
Michele  250 500 250  60
Obama     15  45 520 600

I would like to list the states where Obama has higher amount received (ie
in CA and NY) and also the number of states, in this case 2. How to do this?

Thanks



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