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plyr is a set of tools that solves a common set of problems: you
need to break a big problem down into manageable pieces, operate
on each pieces and then put all the pieces back together. For
example, you might want to fit a model to each spatial location or
time point in your study, summarise data by panels or collapse
high-dimensional arrays to simpler summary statistics. The development
of plyr has been generously supported by BD (Becton Dickinson).
WWW: https://cran.r-project.org/web/packages/plyr/
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