David
Simón
RBSpain · AE Kifisia
Player dossierSuper League
DavidSimón
RBRight-BackDefender
- Club
- AE Kifisia
- League
- Super League
- Nationality
- Spain
- Age
- 37
- Height
- 179 cm
- Foot
- Right
- Valued
- 4 Jun 2026
Super LeagueReading the valuation
The market values Simón at €50k. Model A, which never saw Simón during training, estimates €65k: the market value is 23% below that estimate.
That is a factor of ×1.29. Model A's typical held-out miss is ×1.50 either way, so this gap is within its usual error.
Without league and club, Model B estimates €73k, 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
- 22
- Minutes
- 1,799
- Goals
- 0
- Assists
- 1
- Started
- 20/22
- Min / app
- 82
- Cards
- 7Y 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 Simón…
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 €50k
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)
Starts
Share of appearances started rather than entered from the bench.
91% this player83% defender median72nd 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
- €500k
- Jan 2015
- Peak
- €2M
- Jul 2016
- Model target
- €50k
- Jun 2026
- Valuations
- 26
- 4 club changes
Jun 2026: €50k, AE Kifisia. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2015-01-08 | €500k | UD Las Palmas |
| 2015-07-01 | €1M | UD Las Palmas |
| 2016-02-22 | €1.5M | UD Las Palmas |
| 2016-07-15 | €2M | UD Las Palmas |
| 2017-01-24 | €1.5M | UD Las Palmas |
| 2017-06-05 | €1.5M | UD Las Palmas |
| 2018-01-01 | €1M | UD Las Palmas |
| 2018-05-30 | €800k | UD Las Palmas |
| 2019-02-19 | €800k | Deportivo de La Coruña |
| 2019-06-29 | €800k | Deportivo de La Coruña |
| 2019-12-20 | €600k | Deportivo de La Coruña |
| 2020-04-08 | €475k | Deportivo de La Coruña |
| 2020-10-08 | €400k | FC Cartagena |
| 2021-01-08 | €200k | FC Cartagena |
| 2021-06-24 | €200k | FC Cartagena |
| 2021-12-27 | €200k | FC Cartagena |
| 2022-06-09 | €150k | PAS Lamia 1964 |
| 2022-11-07 | €150k | PAS Lamia 1964 |
| 2023-05-22 | €150k | PAS Lamia 1964 |
| 2023-12-20 | €150k | PAS Lamia 1964 |
| 2024-05-30 | €100k | PAS Lamia 1964 |
| 2024-09-24 | €75k | AE Kifisia |
| 2024-12-27 | €75k | AE Kifisia |
| 2025-05-16 | €50k | AE Kifisia |
| 2025-12-12 | €50k | AE Kifisia |
| 2026-06-04 | €50k | AE Kifisia |
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
- −0.258
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 0% of the 356 Super League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 0% of the 2,065 defenders.
See them in the Explorer →Where Simón appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- BotíaCBAE Kifisia · Super League€50k
- MoutinhoRWAE Larisa · Super League€50k
- KarasalidisCBPanserraikos · Super League€50k
- ZivkovicGKPanetolikos · Super League€75k
- UtsievRBAkhmat Grozny · defenders€50k
- KöybaşıLBGöztepe · defenders€50k
- AlbornozLBVejle Boldklub · defenders€50k
- AurélioRBCD Nacional · defenders€50k
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).