Use plyr instead of _apply() in R

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I’ve covered plyr once before, showing you how to get means and variances for two quantitative traits across multilocus genotypes. JD Long over at Cerebral Mastication recently posted a nice screencast illustrating how plyr “just works” as an alternative to R’s family of apply commands.  There’s a set of R functions (apply, sapply, lapply, tapply, eapply, and rapply) that can apply a command or

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