The correlation between Assists and Kills is -0.74. The more Assists, the less Kills, and vice versa. But some values are higher than expected, some are lower. Efficiency is a difference between the value of Kills depending on Assists (blue dots) with respect to the expected value (red line).
Efficiency
Zeus 4.6599
Spectre 4.1931
Riki 3.2913
Arc Warden 2.3991
Clinkz 2.3967
Ursa 2.3457
Sniper 2.3136
Axe 2.2726
Spirit Breaker 2.2044
Nyx Assassin 2.0713
Necrophos 2.0362
Phantom Assassin 2.0217
Timbersaw 1.8492
Storm Spirit 1.8340
Ember Spirit 1.6630
Void Spirit 1.5556
Viper 1.5532
Outworld Destroyer 1.4867
Bloodseeker 1.4561
Razor 1.4222
Weaver 1.2977
Puck 1.2490
Undying 1.2404
Legion Commander 1.0736
Venomancer 1.0275
Death Prophet 0.9864
Night Stalker 0.9156
Disruptor 0.8481
Skywrath Mage 0.8263
Pudge 0.7931
Tinker 0.7928
Queen of Pain 0.7839
Primal Beast 0.7792
Nature's Prophet 0.6509
Earth Spirit 0.6469
Witch Doctor 0.6431
Bristleback 0.6119
Clockwerk 0.6115
Ancient Apparition 0.6039
Leshrac 0.5850
Lina 0.5295
Silencer 0.5259
Invoker 0.4956
Earthshaker 0.4695
Windranger 0.4125
Lich 0.4123
Centaur Warrunner 0.3983
Pangolier 0.3710
Sand King 0.3583
Meepo 0.3545
Templar Assassin 0.3506
Bounty Hunter 0.3464
Dawnbreaker 0.3178
Slark 0.2265
Huskar 0.2243
Slardar 0.1918
Monkey King 0.1610
Techies 0.1387
Lifestealer 0.1332
Dark Seer 0.0950
Kunkka 0.0728
Visage 0.0627
Drow Ranger 0.0097
Marci -0.0180
Tusk -0.0564
Shadow Fiend -0.0656
Chaos Knight -0.0688
Hoodwink -0.0895
Grimstroke -0.1950
Dark Willow -0.2142
Juggernaut -0.2206
Gyrocopter -0.2411
Phoenix -0.3246
Troll Warlord -0.3386
Warlock -0.3641
Underlord -0.4012
Morphling -0.4828
Rubick -0.5148
Snapfire -0.5206
Doom -0.5285
Tiny -0.5720
Wraith King -0.5741
Faceless Void -0.6116
Muerta -0.6452
Shadow Demon -0.6717
Treant Protector -0.7016
Mars -0.7184
Pugna -0.7238
Ogre Magi -0.7241
Lycan -0.7365
Phantom Lancer -0.7405
Oracle -0.7649
Jakiro -0.9068
Brewmaster -0.9265
Mirana -1.0147
Keeper of the Light -1.0334
Magnus -1.0932
Elder Titan -1.1005
Sven -1.1362
Omniknight -1.1911
Beastmaster -1.2400
Shadow Shaman -1.2665
Anti-Mage -1.3510
Bane -1.3906
Tidehunter -1.4384
Vengeful Spirit -1.5085
Broodmother -1.5175
Batrider -1.6106
Crystal Maiden -1.7116
Alchemist -1.7389
Winter Wyvern -1.7577
Abaddon -1.8641
Enigma -1.8764
Medusa -1.9218
Lion -1.9737
Dragon Knight -2.0093
Luna -2.0123
Enchantress -2.0724
Dazzle -2.2008
Lone Druid -2.3999
Terrorblade -2.5093
Io -2.6651
Naga Siren -3.0925
Chen -4.2898