R : Collapsing a data.frame to a data.frame -- problems with by() and aggregate()

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R : Collapsing a data.frame to a data.frame -- problems with by() and aggregate()
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R : Collapsing a data.frame to a data.frame -- problems with by() and aggregate()
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and with a aggregate() by() : -- to a data.frame problems Collapsing R data.frame



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