A review of plyr (1.7.1)


far and away the most useful R package

let me chart the course of my plyr journey. first i discover the elegance of ddply for summary statistics, recoding and reshaping data. then i discover the use of dlply, llply, and ldply in fitting large numbers of models for bootstraps, subpopulation models etc. The I discover the elegance of the rlply for countless types of simulation. Without doubt, the most rewarding R package I know. I think it's especially valuable for those with low to moderate programming chops.