Item Slam
Patch 7.41f
Wraith Band in patch 7.41f: WPA of the purchase on 21 heroes, by role and build slot, against the other items bought in the same slot. Highest WPA, still inconclusive: Hoodwink core, lane item (+5.65 pp).
WPA of the item against the other items bought in the same slot, in matches of every rank. Slots with fewer than 30 purchases are left out.
| Hero | Role | Slot | Purchases | WPA | 95% CI | Verdict |
|---|---|---|---|---|---|---|
 Hoodwink | Core | Lane item | 31 (14.2%) | +5.65 | +0.00 to +10.78 | Inconclusive |
 Invoker | Core | Lane item | 123 (0.7%) | +5.44 | −0.46 to +10.51 | Inconclusive |
 Outworld Devourer | Core | Lane item | 74 (0.4%) | +4.60 | −2.31 to +11.19 | Inconclusive |
 Necrophos | Core | Lane item | 68 (0.5%) | +4.16 | −3.26 to +10.27 | Inconclusive |
 Winter Wyvern | Support | 2nd lane item | 31 (1.6%) | +3.76 | −2.87 to +10.58 | Inconclusive |
| Necrophos | Core | 2nd lane item | 47 (0.5%) | +3.44 | −3.57 to +9.50 | Inconclusive |
 Mirana | Support | 3º | 37 (9.1%) | +2.84 | −0.79 to +7.19 | Inconclusive |
 Phantom Lancer | Core | 3º | 37 (36.3%) | +2.40 | −1.89 to +7.27 | Inconclusive |
| Hoodwink | Support | Lane item | 108 (0.7%) | +2.36 | −3.56 to +8.49 | Inconclusive |
| Outworld Devourer | Core | 2nd lane item | 77 (0.6%) | +2.09 | −4.65 to +8.37 | Inconclusive |
 Sniper | Core | 3º | 280 (29.7%) | +1.86 | −3.46 to +6.37 | Inconclusive |
| Invoker | Core | 2nd lane item | 168 (1.2%) | +1.80 | −3.28 to +6.65 | Inconclusive |
| Sniper | Support | Lane item | 199 (41.5%) | +1.65 | −1.57 to +4.43 | Inconclusive |
| Winter Wyvern | Support | Lane item | 38 (0.3%) | +1.62 | −7.77 to +9.63 | Inconclusive |
 Lion | Core | Lane item | 204 (10.9%) | +1.27 | −3.59 to +5.82 | Inconclusive |
| Phantom Lancer | Core | Lane item | 2,406 (21.1%) | +0.91 | −0.56 to +2.81 | Inconclusive |
 Windranger | Support | Lane item | 59 (0.7%) | +0.68 | −5.74 to +6.42 | Inconclusive |
| Mirana | Core | Lane item | 125 (15.1%) | +0.53 | −4.06 to +4.96 | Inconclusive |
| Mirana | Core | 2nd lane item | 77 (16.1%) | +0.41 | −3.99 to +5.02 | Inconclusive |
 Sven | Core | Lane item | 50 (0.6%) | +0.30 | −6.27 to +8.14 | Inconclusive |
| Invoker | Core | 3º | 36 (0.8%) | +0.18 | −5.85 to +5.79 | Inconclusive |
| Phantom Lancer | Core | 2nd lane item | 635 (23.9%) | +0.18 | −0.97 to +1.59 | Inconclusive |
| Sniper | Core | Lane item | 4,322 (85.6%) | +0.10 | −0.33 to +0.54 | Inconclusive |
 Juggernaut | Core | 2nd lane item | 584 (29.4%) | +0.06 | −0.89 to +0.99 | Inconclusive |
 Luna | Core | 2nd lane item | 727 (39.2%) | +0.00 | −1.07 to +1.07 | Inconclusive |
 Drow Ranger | Core | 3º | 929 (20.5%) | −0.03 | −1.69 to +1.99 | Inconclusive |
 Anti-Mage | Core | 2nd lane item | 638 (26.2%) | −0.05 | −2.59 to +1.82 | Inconclusive |
| Lion | Core | 2nd lane item | 92 (10.0%) | −0.11 | −5.02 to +4.97 | Inconclusive |
 Magnus | Core | 3º | 155 (10.8%) | −0.24 | −3.52 to +2.99 | Inconclusive |
| Mirana | Support | Lane item | 459 (2.7%) | −0.79 | −4.73 to +2.43 | Inconclusive |
| Hoodwink | Support | 2nd lane item | 34 (0.4%) | −0.81 | −8.53 to +5.58 | Inconclusive |
| Magnus | Core | 2nd lane item | 610 (12.9%) | −0.81 | −4.25 to +2.18 | Inconclusive |
| Drow Ranger | Core | 2nd lane item | 5,139 (16.1%) | −0.92 | −2.20 to +0.33 | Inconclusive |
 Slark | Support | Lane item | 33 (4.8%) | −0.97 | −5.87 to +3.78 | Inconclusive |
| Drow Ranger | Support | 2nd lane item | 67 (26.2%) | −1.09 | −5.73 to +3.27 | Inconclusive |
| Sniper | Support | 2nd lane item | 87 (46.8%) | −1.25 | −5.08 to +2.54 | Inconclusive |
| Drow Ranger | Core | 4º+ | 56 (25.1%) | −1.65 | −4.84 to +0.56 | Inconclusive |
| Mirana | Support | 2nd lane item | 165 (1.6%) | −1.75 | −5.50 to +3.03 | Inconclusive |
| Slark | Core | Lane item | 2,255 (13.1%) | −1.90 | −3.92 to −0.14 | Inconclusive |
| Drow Ranger | Core | Lane item | 8,870 (22.6%) | −2.08 | −2.93 to −1.21 | ✕ Worse |
| Windranger | Core | 2nd lane item | 262 (2.8%) | −2.09 | −7.01 to +2.96 | Inconclusive |
| Luna | Core | Lane item | 1,729 (11.6%) | −2.15 | −4.11 to +0.00 | Inconclusive |
| Drow Ranger | Support | Lane item | 130 (31.8%) | −2.30 | −5.45 to +0.78 | Inconclusive |
| Windranger | Core | 3º | 82 (1.8%) | −2.32 | −7.68 to +2.56 | Inconclusive |
| Windranger | Core | Lane item | 370 (3.2%) | −2.33 | −6.48 to +2.02 | Inconclusive |
| Magnus | Core | Lane item | 741 (10.2%) | −2.56 | −5.10 to +1.19 | Inconclusive |
| Slark | Core | 3º | 58 (3.4%) | −2.65 | −6.33 to +1.61 | Inconclusive |
| Luna | Core | 3º | 46 (52.3%) | −2.76 | −7.29 to +3.98 | Inconclusive |
| Anti-Mage | Core | Lane item | 3,057 (28.6%) | −2.88 | −4.19 to −1.46 | ✕ Worse |
| Slark | Core | 2nd lane item | 665 (6.4%) | −2.95 | −5.82 to −0.08 | Inconclusive |
| Juggernaut | Core | Lane item | 2,242 (17.9%) | −3.22 | −5.03 to −1.43 | ✕ Worse |
| Anti-Mage | Core | 3º | 37 (21.8%) | −3.24 | −7.50 to +1.15 | Inconclusive |
| Sniper | Core | 2nd lane item | 2,621 (67.1%) | −3.51 | −5.91 to −0.81 | Inconclusive |
| Lion | Support | Lane item | 38 (0.3%) | −3.55 | −9.77 to +3.49 | Inconclusive |
| Lion | Support | 2nd lane item | 36 (3.5%) | −4.61 | −10.97 to +2.08 | Inconclusive |
 Wraith King | Core | Lane item | 55 (1.1%) | −4.81 | −13.72 to +4.14 | Inconclusive |
 Pudge | Core | Lane item | 40 (0.2%) | −6.48 | −13.46 to +1.76 | Inconclusive |
 Legion Commander | Core | Lane item | 39 (0.4%) | −7.82 | −16.34 to +1.52 | Inconclusive |
 Ember Spirit | Core | Lane item | 87 (0.6%) | −8.20 | −14.48 to +0.34 | Inconclusive |
Win probability added: how much choosing an item changed the chance of winning, in percentage points, compared with what the hero usually buys in that same slot and situation. +1.0 means the choice won 1 percentage point more than the typical purchase. Unlike raw win rate, it accounts for the game state when the item was bought, so an item bought from ahead doesn't look good just because the game was already won.
1st, 2nd, 3rd and 4th+ count completed items. Components that become another item in most matches (Perseverance, Dragon Lance, Kaya) do not take a slot: the item they build into does. Boots get a card of their own.
The ✓ Better or ✕ Worse badge only appears when the effect passes the false discovery control (10%) in both ways of measuring: at the start of the decision and at the moment of purchase. Without a badge, the sign of the WPA is a trend.
Ranked (All Pick) matches parsed by OpenDota in the current patch. One model estimates the chance of winning from the game state; another, the effect of each item at the time of the decision. It is association, not causation: the model sees the game, not who is playing.