The correlation between gpm and Win Rate is 0.62. The more gpm, the more Win Rate, and vice versa. But some values are higher than expected, some are lower. Efficiency is a difference between the value of Win Rate depending on gpm (blue dots) with respect to the expected value (red line).
Efficiency
Boots Of Bearing 0.1491
Holy Locket 0.1376
Guardian Greaves 0.1322
Vladmir'S Offering 0.1067
Aeon Disk 0.0925
Assault Cuirass 0.0924
Overwhelming Blink 0.0902
Wind Waker 0.0871
Moon Shard 0.0868
Heart Of Tarrasque 0.0806
Octarine Core 0.0786
Arcane Blink 0.0761
Refresher Orb 0.0735
Shiva'S Guard 0.0665
Yasha And Kaya 0.0650
Pavise 0.0630
Revenant'S Brooch 0.0609
Solar Crest 0.0588
Dagon (5) 0.0586
Lotus Orb 0.0576
Pipe Of Insight 0.0546
Meteor Hammer 0.0544
Boots Of Travel 0.0518
Aether Lens 0.0492
Aghanim'S Scepter 0.0447
Glimmer Cape 0.0443
Scythe Of Vyse 0.0438
Crimson Guard 0.0410
Veil Of Discord 0.0333
Ethereal Blade 0.0332
Harpoon 0.0330
Spirit Vessel 0.0329
Aghanim'S Shard 0.0323
Helm Of The Overlord 0.0289
Linken'S Sphere 0.0286
Bloodthorn 0.0270
Rod Of Atos 0.0269
Disperser 0.0268
Abyssal Blade 0.0249
Phylactery 0.0243
Bloodstone 0.0240
Aghanim'S Blessing 0.0205
Force Staff 0.0201
Drum Of Endurance 0.0198
Butterfly 0.0174
Kaya And Sange 0.0169
Eul'S Scepter Of Divinity 0.0150
Eye Of Skadi 0.0149
Eternal Shroud 0.0108
Gleipnir 0.0086
Satanic 0.0062
Daedalus 0.0047
Boots Of Travel 2 0.0043
Tranquil Boots 0.0019
Dagon (4) 0.0016
Arcane Boots -0.0025
Blink Dagger -0.0047
Sange And Yasha -0.0073
Heaven'S Halberd -0.0085
Swift Blink -0.0097
Hurricane Pike -0.0117
Radiance -0.0140
Nullifier -0.0148
Mekansm -0.0177
Magic Wand -0.0257
Witch Blade -0.0291
Desolator -0.0298
Dagon (3) -0.0316
Null Talisman -0.0337
Blade Mail -0.0339
Skull Basher -0.0347
Mjollnir -0.0370
Armlet Of Mordiggian -0.0375
Silver Edge -0.0411
Soul Ring -0.0441
Manta Style -0.0443
Bracer -0.0478
Phase Boots -0.0494
Orchid Malevolence -0.0507
Urn Of Shadows -0.0516
Black King Bar -0.0532
Orb Of Corrosion -0.0586
Diffusal Blade -0.0587
Dagon (2) -0.0605
Mage Slayer -0.0663
Monkey King Bar -0.0664
Dagon -0.0686
Power Treads -0.0701
Vanguard -0.0775
Bottle -0.0789
Medallion Of Courage -0.0807
Helm Of The Dominator -0.0836
Echo Sabre -0.0878
Wraith Band -0.0902
Falcon Blade -0.0908
Hand Of Midas -0.0932
Battle Fury -0.0994
Dragon Lance -0.1008
Mask Of Madness -0.1114
Shadow Blade -0.1208
Crystalys -0.1410
Maelstrom -0.1653