The correlation between gpm and Win Rate is 0.63. 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 0.1478
Holy Locket 0.1365
Guardian Greaves 0.1254
Wind Waker 0.1040
Aeon Disk 0.0950
Vladmir'S Offering 0.0926
Overwhelming Blink 0.0879
Moon Shard 0.0851
Octarine Core 0.0774
Assault Cuirass 0.0771
Yasha And Kaya 0.0759
Heart Of Tarrasque 0.0757
Solar Crest 0.0717
Pavise 0.0700
Dagon (5) 0.0681
Lotus Orb 0.0677
Arcane Blink 0.0665
Shiva'S Guard 0.0662
Refresher Orb 0.0646
Revenant'S Brooch 0.0630
Pipe Of Insight 0.0592
Meteor Hammer 0.0587
Spirit Vessel 0.0565
Aether Lens 0.0532
Ethereal Blade 0.0524
Scythe Of Vyse 0.0513
Aghanim'S Scepter 0.0501
Glimmer Cape 0.0485
Boots Of Travel 0.0471
Phylactery 0.0385
Bloodstone 0.0381
Veil Of Discord 0.0380
Bloodthorn 0.0365
Crimson Guard 0.0363
Aghanim'S Shard 0.0357
Linken'S Sphere 0.0297
Force Staff 0.0291
Harpoon 0.0239
Rod Of Atos 0.0233
Eul'S Scepter Of Divinity 0.0232
Butterfly 0.0229
Kaya And Sange 0.0201
Disperser 0.0194
Gleipnir 0.0191
Abyssal Blade 0.0183
Eye Of Skadi 0.0179
Helm Of The Overlord 0.0169
Aghanim'S Blessing 0.0116
Satanic 0.0115
Daedalus 0.0106
Eternal Shroud 0.0052
Heaven'S Halberd 0.0013
Nullifier 0.0005
Boots Of Travel 2 -0.0005
Sange And Yasha -0.0006
Tranquil Boots -0.0018
Dagon (4) -0.0043
Hurricane Pike -0.0056
Swift Blink -0.0088
Drum Of Endurance -0.0099
Blink Dagger -0.0102
Arcane Boots -0.0128
Magic Wand -0.0186
Desolator -0.0243
Mjollnir -0.0286
Blade Mail -0.0292
Witch Blade -0.0299
Null Talisman -0.0303
Silver Edge -0.0381
Bracer -0.0409
Dagon (3) -0.0413
Manta Style -0.0417
Radiance -0.0420
Soul Ring -0.0436
Skull Basher -0.0463
Urn Of Shadows -0.0466
Mekansm -0.0469
Phase Boots -0.0508
Orb Of Corrosion -0.0526
Orchid Malevolence -0.0534
Black King Bar -0.0564
Armlet Of Mordiggian -0.0564
Monkey King Bar -0.0569
Mage Slayer -0.0571
Power Treads -0.0685
Diffusal Blade -0.0692
Falcon Blade -0.0715
Dagon (2) -0.0718
Bottle -0.0725
Dagon -0.0763
Wraith Band -0.0870
Vanguard -0.0900
Dragon Lance -0.0934
Medallion Of Courage -0.0946
Echo Sabre -0.0956
Helm Of The Dominator -0.1045
Hand Of Midas -0.1053
Battle Fury -0.1115
Mask Of Madness -0.1152
Crystalys -0.1205
Shadow Blade -0.1212
Maelstrom -0.1679