The efficiency margin tells us numerically what the tempo-free aerial tells us graphically. It's just the difference between the offensive and defensive efficiencies of the teams. Obviously, the higher the better:
Conference Games Only:
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Michigan State (0.13)
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Wisconsin (0.08)
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Purdue (0.07)
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Illinois (0.07)
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Ohio State (0.02)
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Minnesota (0.01)
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Michigan (-0.02)
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Penn State (-0.04)
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Northwestern (-0.04)
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Iowa (-0.08)
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Indiana (-0.19)