The correlation between Assists and Kills is -0.7. 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
Spectre 4.8454
Zeus 4.5238
Riki 4.0594
Nature's Prophet 2.8238
Phantom Assassin 2.7995
Arc Warden 2.6058
Clinkz 2.5596
Spirit Breaker 2.4142
Necrophos 2.4129
Sniper 2.3036
Tinker 2.2482
Ursa 1.9837
Nyx Assassin 1.9232
Axe 1.9005
Weaver 1.7684
Ember Spirit 1.6237
Void Spirit 1.5641
Bloodseeker 1.4393
Queen of Pain 1.4113
Viper 1.4021
Outworld Destroyer 1.4001
Storm Spirit 1.3694
Razor 1.3173
Legion Commander 1.3103
Chaos Knight 1.2019
Undying 1.1800
Puck 1.1653
Primal Beast 1.0329
Slark 1.0316
Venomancer 1.0155
Dawnbreaker 1.0037
Pangolier 0.9143
Silencer 0.9136
Lina 0.8603
Sand King 0.8283
Invoker 0.7832
Ancient Apparition 0.7802
Tusk 0.7647
Night Stalker 0.7329
Monkey King 0.6764
Slardar 0.6679
Visage 0.6572
Muerta 0.6145
Earthshaker 0.6026
Clockwerk 0.5872
Huskar 0.5368
Bristleback 0.5173
Bounty Hunter 0.5017
Templar Assassin 0.4916
Witch Doctor 0.4294
Skywrath Mage 0.4095
Pudge 0.4088
Earth Spirit 0.3586
Centaur Warrunner 0.3259
Death Prophet 0.3139
Windranger 0.2908
Kunkka 0.2873
Sven 0.2667
Lich 0.2437
Shadow Fiend 0.2140
Faceless Void 0.0878
Drow Ranger 0.0543
Troll Warlord -0.0082
Gyrocopter -0.0197
Phoenix -0.0864
Meepo -0.1561
Grimstroke -0.2160
Brewmaster -0.2440
Pugna -0.2836
Dark Seer -0.2923
Disruptor -0.3217
Treant Protector -0.3295
Dark Willow -0.3314
Timbersaw -0.3735
Wraith King -0.3804
Elder Titan -0.5093
Warlock -0.5195
Techies -0.5217
Lifestealer -0.5227
Morphling -0.5526
Phantom Lancer -0.6357
Oracle -0.6502
Hoodwink -0.6590
Juggernaut -0.6856
Mars -0.7620
Marci -0.8227
Mirana -0.8392
Vengeful Spirit -0.8860
Snapfire -0.9047
Jakiro -0.9224
Lycan -0.9644
Batrider -1.0347
Leshrac -1.0815
Rubick -1.1214
Shadow Demon -1.1569
Ogre Magi -1.2437
Beastmaster -1.3378
Doom -1.4618
Underlord -1.4876
Anti-Mage -1.5315
Tiny -1.6240
Tidehunter -1.6254
Shadow Shaman -1.6914
Lone Druid -1.7047
Magnus -1.7963
Crystal Maiden -1.8034
Omniknight -1.8632
Luna -1.9232
Keeper of the Light -1.9277
Terrorblade -1.9490
Lion -2.0077
Broodmother -2.1131
Dragon Knight -2.1286
Enchantress -2.1915
Dazzle -2.2247
Bane -2.2700
Alchemist -2.2794
Io -2.2940
Enigma -2.5504
Winter Wyvern -2.6353
Abaddon -2.6881
Medusa -2.7949
Naga Siren -2.8016
Chen -3.0163