Yiğit Efe
Demir
CBTürkiye · Fenerbahce
Player dossierSüper Lig
Yiğit EfeDemir
CBCentre-BackDefender
- Club
- Fenerbahce
- League
- Süper Lig
- Nationality
- Türkiye
- Age
- 21
- Height
- 194 cm
- Foot
- Right
- Valued
- 21 May 2026
Reading the valuation
The market values Demir at €6M. Model A, which never saw Demir during training, estimates €2.6M: the market value is 130% above that estimate.
That is a factor of ×2.30. Model A's typical held-out miss is ×1.50 either way, so this gap is larger than its usual error.
Without league and club, Model B estimates €2M, further from the market. Model B is usually further off (typical miss ×2.07): league and club explain much of how the market prices players.
A gap describes the model's arithmetic for this player's inputs, not what the player is worth.
- Apps
- 20
- Minutes
- 931
- Goals
- 0
- Assists
- 0
- Started
- 8/20
- Min / app
- 47
- Cards
- 4Y 0R
Club matches, two years to the valuation date
The Valuation Journey
What moves Model A
Asking the prediction API to explain Model A for Demir…
SHAP describes the model's arithmetic for this player's inputs, not what causes market value. Model B can be explained only by the live service; Model A also has a published explanation for the research players.
Model A vs Model B against the observed €6M
Checking APIAsking the prediction API…
Held-out estimates come from cross-validation, with this player outside the training data: the honest comparison. Served models were refitted on every player, this one included, so they sit closer to the market. Shaded band: Model A's typical miss (×1.50 either way).
Player traitspercentiles vs 2,065 defenders
Dashed ring: the defender median (50th percentile)
European club minutes
Share of minutes played in UEFA club competitions.
28% this player0% defender median93rd percentile
No passing, progression or defensive actions exist in the dataset, so no trait claims to measure them.
Valuation history every Transfermarkt valuation on record
- First valuation
- €50k
- Jul 2023
- Peak
- €6M
- May 2026
- Model target
- €6M
- May 2026
- Valuations
- 13
- 3 club changes
May 2026: €6M, Fenerbahce. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2023-07-11 | €50k | Fenerbahce |
| 2023-10-20 | €50k | Genclerbirligi Ankara |
| 2023-12-29 | €75k | Genclerbirligi Ankara |
| 2024-03-26 | €150k | Genclerbirligi Ankara |
| 2024-06-13 | €200k | Genclerbirligi Ankara |
| 2024-10-16 | €300k | Fatih Karagümrük |
| 2025-01-09 | €375k | Fatih Karagümrük |
| 2025-04-02 | €700k | Fatih Karagümrük |
| 2025-06-25 | €1.3M | Fatih Karagümrük |
| 2025-10-01 | €1.5M | Fenerbahce |
| 2025-12-17 | €2M | Fenerbahce |
| 2026-03-05 | €5M | Fenerbahce |
| 2026-05-21 | €6M | Fenerbahce |
Audit context group-level, not about this player
- Audit group
- UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- +0.834
The group comes from first-listed citizenship and is never a model input. Across the population, non-UEFA players' market values sit about 10% above Model A's held-out estimates, relative to UEFA players in the same leagues. One player's residual says nothing about that pattern (typical miss ×1.50), and none of it is evidence of discrimination: the target may itself be biased. Open the Fairness Audit
In context observed value among comparable players in this build
All players in the Terminal →Süper Lig428 players · median €1.2M
Valued above 84% of the 428 Süper Lig players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 73% of the 2,065 defenders.
See them in the Explorer →Where Demir appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- SemedoRBFenerbahce · Süper Lig€6M
- OnuachuCFTrabzonspor · Süper Lig€6M
- ZubkovRWTrabzonspor · Süper Lig€6M
- DrongelenCBSamsunspor · Süper Lig€6M
- RüdigerCBReal Madrid · defenders€6M
- DigneLBAston Villa · defenders€6M
- RomagnoliCBSS Lazio · defenders€6M
- PoschCB1.FSV Mainz 05 · defenders€6M
Counts and ranks of observed Transfermarkt values only; model errors are never ranked here. Full player export: Every player in the modelling population (D-011).