FairValue

Checking model

Esc

  • EnvironmentOverviewWhat FairValue measures, what it found, where to go next.
  • EnvironmentTerminalExplore, compare and track players; market, league and model views.
  • EnvironmentStoriesValuations, head-to-heads and research findings, told as stories.
  • TerminalPlayer ExplorerSearch, filter and sort the player export.
  • TerminalComparison StudioTwo to four players on one scale.
  • TerminalWatchlistsNamed collections, kept in this browser.
  • TerminalMarket LandscapeHow observed value is distributed, and where the model drifts.

↑ ↓ to move · Enter to open · Esc to closeLoading player index…

Nino

CBBrazil · Zenit St. Petersburg

№ 520454Elite €9.1M +0.10

Player dossierPremier Liga

Nino

CBCentre-BackDefender

Club
Zenit St. Petersburg
League
Premier Liga
Nationality
Brazil
Age
29
Height
188 cm
Foot
Right
Valued
26 May 2026

Reading the valuation

The market values Nino at €10M. Model A, which never saw Nino during training, estimates €9.1M: the market value is 10% above that estimate.

That is a factor of ×1.10. 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 €3.2M, 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.

▲ +0.10A €9.1M▲ +1.14B €3.2M
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
68
Minutes
5,794
Goals
4
Assists
4
Started
67/68
Min / app
85
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 Nino…

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 €10M

Checking API
EmergingEstablishedEliteWorld Class€2M€10M€30M€100k€1M€100MMarket €10MModel A €9.1M

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

Nino's percentiles among defenders: Goals per 90 71st, Assists per 90 64th, Minutes, two years 91st, Starts 94th, Minutes, last 365 days 82nd, European club minutes 30th71stGoals64thAssists91stMinutes94thStarts82ndRecent30thEurope

Dashed ring: the defender median (50th percentile)

Starts

Share of appearances started rather than entered from the bench.

99% this player83% defender median94th percentile

18%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
€300k
Oct 2017
Peak
€11M
Dec 2023
Model target
€10M
May 2026
Valuations
24
2 club changes
May 2026€10MZenit St. PetersburgValuation the model is trained to reproduce

May 2026: €10M, Zenit St. Petersburg. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table
DateMarket valueClub
2017-10-30€300kCriciúma EC
2017-12-07€300kCriciúma EC
2019-05-28€1MFluminense Football Club
2019-08-15€2.5MFluminense Football Club
2019-11-27€2.5MFluminense Football Club
2020-04-08€2MFluminense Football Club
2020-09-09€3MFluminense Football Club
2021-02-09€3MFluminense Football Club
2021-05-28€4MFluminense Football Club
2021-09-10€6MFluminense Football Club
2021-12-17€6.5MFluminense Football Club
2022-04-06€6.5MFluminense Football Club
2022-08-19€7MFluminense Football Club
2022-11-14€7MFluminense Football Club
2023-04-07€7MFluminense Football Club
2023-07-25€7MFluminense Football Club
2023-12-11€11MFluminense Football Club
2024-03-20€10MZenit St. Petersburg
2024-06-04€10MZenit St. Petersburg
2024-12-12€10MZenit St. Petersburg
2025-06-04€11MZenit St. Petersburg
2025-09-18€10MZenit St. Petersburg
2025-12-16€10MZenit St. Petersburg
2026-05-26€10MZenit St. Petersburg

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
+0.097

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 →

Premier Liga412 players · median €1M

Valued above 95% of the 412 Premier Liga players.

€50k€300k€2M€15M€10MSee them in the Explorer →

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

Valued above 81% of the 2,065 defenders.

€20k€200k€2M€20M€10MSee them in the Explorer →

Where Nino appears

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).