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…

Portrait of Jérémy Jacquet

Jérémy

Jacquet

CBFrance · Stade Rennais FC

№ 1004301World Class €8.9M +1.82

Image: FootyLogos

Player dossierLigue 1

JérémyJacquet

CBCentre-BackDefender

Club
Stade Rennais FC
League
Ligue 1
Nationality
France
Age
20
Height
190 cm
Foot
Right
Valued
1 Jun 2026

Reading the valuation

The market values Jacquet at €55M. Model A, which never saw Jacquet during training, estimates €8.9M: the market value is 516% above that estimate.

That is a factor of ×6.16. 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 €1.6M, 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.

▲ +1.82A €8.9M▲ +3.52B €1.6M
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
30
Minutes
2,602
Goals
0
Assists
1
Started
30/30
Min / app
87
Cards
4Y 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 Jacquet…

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 €55M

Checking API
EmergingEstablishedEliteWorld Class€2M€10M€30M€100k€1M€100MMarket €55MModel A €8.9M

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

Jérémy Jacquet's percentiles among defenders: Goals per 90 18th, Assists per 90 47th, Minutes, two years 45th, Starts 97th, Minutes, last 365 days 50th, European club minutes 30th18thGoals47thAssists45thMinutes97thStarts50thRecent30thEurope

Dashed ring: the defender median (50th percentile)

Starts

Share of appearances started rather than entered from the bench.

100% this player83% defender median97th 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
€50k
Jun 2023
Peak
€55M
Mar 2026
Model target
€55M
Jun 2026
Valuations
12
2 club changes
Jun 2026€55MStade Rennais FCValuation the model is trained to reproduce

Jun 2026: €55M, Stade Rennais FC. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table
DateMarket valueClub
2023-06-27€50kStade Rennais FC B
2023-12-18€50kStade Rennais FC B
2024-03-19€300kClermont Foot 63
2024-06-03€500kClermont Foot 63
2024-10-03€600kClermont Foot 63
2024-12-04€1MClermont Foot 63
2025-03-24€5MStade Rennais FC
2025-06-03€10MStade Rennais FC
2025-10-10€12MStade Rennais FC
2025-12-15€20MStade Rennais FC
2026-03-27€55MStade Rennais FC
2026-06-01€55MStade Rennais FC

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
+1.818

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 →

Ligue 1423 players · median €5M

Valued above 97% of the 423 Ligue 1 players.

€100k€750k€5M€30M€55MSee them in the Explorer →

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

Valued above 99% of the 2,065 defenders.

€20k€200k€2M€20M€55MSee them in the Explorer →

Where Jacquet 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).