FinnStam

CBCentre-BackDefender

Club: Willem II Tilburg
League: Eredivisie
Nationality: Netherlands
Age: 22
Height: 188 cm
Foot: Right
Valued: 16 Dec 2025

Reading the valuation

The market values Stam at €450k. Model A, which never saw Stam during training, estimates €263k: the market value is 71% above that estimate.

That is a factor of ×1.71. 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 €669k, closer to the market here, although it is usually further off (typical miss ×2.07).

A gap describes the model's arithmetic for this player's inputs, not what the player is worth.

Pitch length is a log value scale fitted to this player's figures. ● observed · ◇ Model A · dashed ◇ Model B · each arc is a residual, log(observed) − log(estimate).

Apps: 22
Minutes: 1,020
Goals: 0
Assists: 1
Started: 11/22
Min / app: 46
Cards: 3Y 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 Stam…

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 €450k

Checking API

Asking 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)

Assists per 90

Club assists per 90 minutes in the same window.

0.09 this player0.04 defender median74th percentile

0.00peer deciles · median line · this player ●0.58

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: €75k; Oct 2022
Peak: €750k; Oct 2024
Model target: €450k; Dec 2025
Valuations: 9; 2 club changes

Dec 2025€450kWillem II TilburgValuation the model is trained to reproduce

Dec 2025: €450k, Willem II Tilburg. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table

Date	Market value	Club
2022-10-12	€75k	AZ Alkmaar U21
2023-07-04	€175k	AZ Alkmaar U21
2024-01-08	€300k	AZ Alkmaar U21
2024-06-10	€300k	AZ Alkmaar U21
2024-10-14	€750k	FC Groningen
2024-12-17	€650k	FC Groningen
2025-03-28	€500k	FC Groningen
2025-05-28	€450k	FC Groningen
2025-12-16	€450k	Willem II Tilburg

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: +0.536

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 →

Eredivisie425 players · median €1M

Valued above 22% of the 425 Eredivisie players.

See them in the Explorer →

Defenders, all leagues2,065 players · median €2M

Valued above 17% of the 2,065 defenders.

See them in the Explorer →

Where Stam appears

TerminalEredivisie in the Player Explorer
TerminalEredivisie on the League Landscape

Watchlists and the comparison tray are kept in this browser only.

Near this valuation closest observed values: same league, then same position

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).