QBASE explained:  https://www.footballoutsiders.com/stat-analysis/2015/introducing-qbase To sum up what QBASE is, the most important factors that impact QBASE are the following:  1) College performance (comp %, adjusted YPA, passing efficiency), adjusted for opposition and teammates 2) College experience, adjusted for quality, and 3) Projected draft slot.  The QBASE score is expressed using projected DYAR (Defense-adjusted Yards Above Replacement) for Years 3-5 of the QB's pro career. 
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