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How to use tapply with more than one variables grouped

noobmin 
I used these commands previously:

data <- read.csv("test.csv")
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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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