The other day, ESPN.com's John Hollinger rolled out a method for converting his famous Player Efficiency Rating to a "wins over replacement"-type stat. Now Kevin Pelton of Basketball Prospectus, who developed a similar metric (WARP), takes a look at the two methods side by side. Spoiler: mostly they agree (LeBron James owns everyone), but there are some subtle differences in the replacement level and the way defense is incorporated.

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