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How to use tapply with more than one variables grouped

noobmin 
interTable <-data.frame (Tapply ($ contb_receipt_amt date, list ($ cand_nm
date, $ contbr_st date), sum))

I got create a table with the sum total contribution (contb_receipt_amt) of
each presidential candidate (cand_nm) in each state (contbr_st). How could
from interTable create a table of  states where candidate 'Obama' has
received greater Contribution?

thanks



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noobmin How to use tapply with more than one variables grouped Oct 21 PIKAL Petr How to use tapply with more than one variables grouped Oct 22 noobmin How to use tapply with more than one variables grouped Oct 22 PIKAL Petr How to use tapply with more than one variables grouped Oct 22 Bert Gunter How to use tapply with more than one variables grouped Oct 22 PIKAL Petr How to use tapply with more than one variables grouped Oct 22 noobmin How to use tapply with more than one variables grouped Oct 23 noobmin How to use tapply with more than one variables grouped Oct 23 PIKAL Petr How to use tapply with more than one variables grouped Oct 23 arun How to use tapply with more than one variables grouped Oct 23 noobmin How to use tapply with more than one variables grouped Oct 23 arun How to use tapply with more than one variables grouped Oct 23 noobmin How to use tapply with more than one variables grouped Oct 23 noobmin How to use tapply with more than one variables grouped Oct 23 arun How to use tapply with more than one variables grouped Oct 23 Bert Gunter How to use tapply with more than one variables grouped Oct 23 noobmin How to use tapply with more than one variables grouped Oct 23 David Winsemius How to use tapply with more than one variables grouped Oct 23 arun How to use tapply with more than one variables grouped Oct 23