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plyr is a set of tools for a common set of problems: you need to split up a big data structure into homogeneous pieces, apply a function to each piece and then combine all the results back together. For example, you might want to:

fit the same model to subsets of a data frame
quickly calculate summary statistics for each group
perform group-wise transformations like scaling or standardising
r  plyr  package  data  transformation  statistics 
january 2012 by jerid.francom
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