There is no correlation between Duration and Hero Damage and there are no clusters. The values are standardized.
Duration Hero Damage
Abaddon -0.906268 -1.073482
Alchemist -0.558111 -0.125509
Ancient Apparition 2.053064 -0.681879
Anti-Mage 0.022150 -0.225403
Arc Warden 0.370306 2.027890
Axe 0.969910 0.921528
Bane 0.157544 -1.367486
Batrider -0.306665 -0.780370
Beastmaster -2.028106 -0.112687
Bloodseeker 1.163330 0.683339
Bounty Hunter -0.442059 -0.768186
Brewmaster -0.809558 -0.292956
Bristleback 0.757147 1.951980
Broodmother -3.207971 -0.494785
Centaur Warrunner 0.118860 0.110511
Chaos Knight -0.809558 0.445788
Chen -2.550341 -2.144376
Clinkz -0.267981 0.635688
Clockwerk 0.428333 -0.254746
Crystal Maiden 0.312280 -1.386687
Dark Seer 0.234912 -0.234716
Dark Willow 0.931226 -0.414411
Dawnbreaker -0.674164 -0.025360
Dazzle -0.577453 -1.871294
Death Prophet 0.041492 0.386081
Disruptor 0.234912 -1.768402
Doom 0.718463 -0.587535
Dragon Knight -0.055218 -0.274074
Drow Ranger 1.143988 0.578533
Earth Spirit -0.577453 -0.502057
Earthshaker 0.873199 0.170920
Elder Titan 1.163330 -0.371544
Ember Spirit -0.016534 1.548449
Enchantress 0.544385 -0.617962
Enigma 0.583069 -0.270949
Faceless Void 1.027936 -0.241031
Grimstroke 0.118860 -1.402507
Gyrocopter -0.422717 1.804563
Hoodwink 1.105304 -0.420471
Huskar -1.351135 0.799882
Invoker 0.621753 0.326310
Io -2.975866 -2.750183
Jakiro 0.583069 -0.551111
Juggernaut -0.403375 0.560545
Keeper of the Light 0.234912 -0.562593
Kunkka 0.931226 0.416253
Legion Commander -0.345349 0.892504
Leshrac -0.229297 0.858696
Lich 0.834515 -0.908331
Lifestealer -0.480743 0.107194
Lina 0.718463 0.845874
Lion 0.525043 -1.856941
Lone Druid -3.072576 -0.388831
Luna -0.654822 0.367136
Lycan -2.453631 -0.868590
Magnus -0.209955 -1.420559
Marci -1.583239 -1.343821
Mars -0.074560 -0.581283
Medusa 1.820959 0.587017
Meepo -2.975866 0.140811
Mirana 0.408991 -1.330935
Monkey King -0.267981 0.583636
Morphling -1.389819 0.482467
Muerta 1.105304 1.625826
Naga Siren -0.538769 -0.132972
Nature's Prophet -0.209955 0.388377
Necrophos -0.229297 1.671052
Night Stalker -0.538769 -0.589002
Nyx Assassin 0.679779 0.354888
Ogre Magi 0.254254 -0.347560
Omniknight -0.616138 -0.859086
Oracle -1.177057 -1.973995
Outworld Destroyer -0.074560 1.224591
Pangolier 0.022150 0.437814
Phantom Assassin -0.461401 1.514960
Phantom Lancer 0.757147 1.006878
Phoenix 0.254254 -0.372246
Primal Beast -0.035876 0.329819
Puck -0.074560 0.903731
Pudge -0.055218 -0.625617
Pugna 0.118860 0.451975
Queen of Pain 0.602411 1.253360
Razor 0.467017 1.146896
Riki 0.950568 0.750190
Rubick 0.583069 -0.844669
Sand King 1.260040 0.491780
Shadow Demon 0.602411 -0.917581
Shadow Fiend -0.944952 1.033542
Shadow Shaman 0.157544 -1.367423
Silencer 0.679779 -0.484834
Skywrath Mage 0.563727 -0.052534
Slardar -0.229297 -0.443818
Slark -0.113245 -0.100185
Snapfire 0.312280 -0.503205
Sniper 1.530829 1.704287
Spectre 1.318066 2.085683
Spirit Breaker -0.035876 -0.724682
Storm Spirit 0.234912 0.330329
Sven -0.055218 0.737751
Techies 1.898327 0.781830
Templar Assassin -0.944952 0.826993
Terrorblade -0.248639 0.281849
Tidehunter -0.209955 -0.876755
Timbersaw 0.041492 0.555761
Tinker 0.718463 2.253066
Tiny -0.055218 -0.378689
Treant Protector -0.732190 -1.530149
Troll Warlord -0.693506 0.782531
Tusk -0.403375 -0.838099
Underlord 0.215570 -0.308074
Undying -0.074560 -1.586347
Ursa 0.292938 0.991186
Vengeful Spirit -0.809558 -1.529511
Venomancer 0.679779 0.271707
Viper 1.530829 0.907686
Visage -2.202185 -0.311072
Void Spirit -0.364691 0.518954
Warlock 0.196228 0.077596
Weaver 0.892541 0.758228
Windranger 1.008594 -0.185726
Winter Wyvern 0.950568 -0.959873
Witch Doctor 0.911884 0.309470
Wraith King -0.442059 0.497521
Zeus 1.704907 2.626042