Offensive win share and defensive win share

[Archaeon]

I'm share most people here are familiar with basketball-reference. In the advanced table,there this offensive win share and defensive win share,how do they calculate this stats and base on what basis?

[bondom34]

Sorry, theres not really enough room to post the whole thing, but go to the top right of basketball reference, under the "More" tab, to the glossary, and they explain the calculation.