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

[noobmin]

I used these commands previously:

data <- read.csv("test.csv")
> tbl=
> data.frame(tapply(data$contb_receipt_amt,list(data$cand_nm,data$contbr_st),sum))
> tbl
                AL  AR  CA  NY
Doug     250 250 250  NA
Jennifer  20 340 300 100
Michele  250 500 250  60
Obama     15  45 520 600



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