David
Martínez
DMArgentina · Volos NFC
Player dossierSuper League
DavidMartínez
DMDefensive MidfieldMidfield
- Club
- Volos NFC
- League
- Super League
- Nationality
- Argentina
- Age
- 21
- Height
- 170 cm
- Foot
- –
- Valued
- 4 Jun 2026
Super LeagueReading the valuation
The market values Martínez at €1.2M. Model A, which never saw Martínez during training, estimates €787k: the market value is 52% above that estimate.
That is a factor of ×1.52. 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 €366k, 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
- 18
- Minutes
- 1,299
- Goals
- 2
- Assists
- 1
- Started
- 17/18
- Min / app
- 72
- Cards
- 8Y 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 Martínez…
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 €1.2M
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 1,687 midfielders
Dashed ring: the midfielder median (50th percentile)
Starts
Share of appearances started rather than entered from the bench.
94% this player69% midfielder median92nd 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
- €1.5M
- Sept 2024
- Model target
- €1.2M
- Jun 2026
- Valuations
- 10
- 2 club changes
Jun 2026: €1.2M, Volos NFC. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2023-07-04 | €50k | CA Independiente II |
| 2023-12-19 | €75k | CA Independiente II |
| 2024-03-11 | €300k | CA Independiente |
| 2024-06-12 | €800k | CA Independiente |
| 2024-09-30 | €1.5M | CA Independiente |
| 2024-12-13 | €1.5M | CA Independiente |
| 2025-04-02 | €1.2M | CA Independiente |
| 2025-06-02 | €1M | CA Independiente |
| 2025-12-12 | €1.2M | Volos NFC |
| 2026-06-04 | €1.2M | Volos NFC |
Audit context group-level, not about this player
- Audit group
- non-UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- +0.422
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 →Super League356 players · median €600k
Valued above 69% of the 356 Super League players.
See them in the Explorer →Midfielders, all leagues1,687 players · median €2M
Valued above 35% of the 1,687 midfielders.
See them in the Explorer →Where Martínez appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- OzdoevDMPAOK Thessaloniki · Super League€1.2M
- SiopisDMPanathinaikos · Super League€1.2M
- PelkasAMPAOK Thessaloniki · Super League€1.2M
- MoutoussamyCMAtromitos Athens · Super League€1.2M
- WitselDMGirona FC · midfielders€1.2M
- HendersonDMBrentford FC · midfielders€1.2M
- CabellaAMFC Nantes · midfielders€1.2M
- YokuşluDMTrabzonspor · midfielders€1.2M
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).