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== Original Formula ==
 
The formula below appeared in ''The Book.''<ref>{{Cite book|last=Tango, Tom M.,|url=https://www.worldcat.org/oclc/919473395|title=The book : playing the percentages in baseball|others=Lichtman, Mitchel G.,, Dolphin, Andrew E.,|isbn=978-1-4942-6017-0|location=[Place of publication not identified]|oclc=919473395}}</ref>
 
<math>wOBA=\frac{(0.72*NIBB) + (0.75*HBP) + (0.90*\mathit{1}B) + (0.92*RBOE) + (1.24*\mathit{2}B) + (1.56*\mathit{3}B) + (1.95*HR)}{PA}</math>