MariosSofianos

RWRight WingerAttack

Club: Panserraikos
League: Super League
Nationality: Greece
Age: 22
Height: 175 cm
Foot: –
Valued: 4 Jun 2026

Reading the valuation

The market values Sofianos at €175k. Model A, which never saw Sofianos during training, estimates €205k: the market value is 15% below that estimate.

That is a factor of ×1.17. 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 €231k, 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.

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: 541
Goals: 0
Assists: 0
Started: 5/22
Min / app: 25
Cards: 5Y 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 Sofianos…

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 €175k

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 1,583 attackers

Dashed ring: the attacker median (50th percentile)

European club minutes

Share of minutes played in UEFA club competitions.

0% this player0% attacker median28th percentile

0%peer deciles · median line · this player ●100%

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: €25k; Dec 2021
Peak: €200k; Jun 2023
Model target: €175k; Jun 2026
Valuations: 10; 0 club changes

Jun 2026€175kPanserraikosValuation the model is trained to reproduce

Jun 2026: €175k, Panserraikos. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table

Date	Market value	Club
2021-12-28	€25k	Panserraikos
2022-06-27	€25k	Panserraikos
2023-02-27	€100k	Panserraikos
2023-06-19	€200k	Panserraikos
2023-12-20	€200k	Panserraikos
2024-05-30	€200k	Panserraikos
2024-12-18	€200k	Panserraikos
2025-05-23	€200k	Panserraikos
2025-12-12	€175k	Panserraikos
2026-06-04	€175k	Panserraikos

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: −0.157

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 8% of the 356 Super League players.

See them in the Explorer →

Attackers, all leagues1,583 players · median €2.5M

Valued above 4% of the 1,583 attackers.

See them in the Explorer →

Where Sofianos appears

TerminalSuper League in the Player Explorer
TerminalSuper League 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).