Kelvin
John
CFTanzania · Aalborg BK
Player dossierSuperliga
KelvinJohn
CFCentre-ForwardAttack
- Club
- Aalborg BK
- League
- Superliga
- Nationality
- Tanzania
- Age
- 22
- Height
- 175 cm
- Foot
- Right
- Valued
- 18 Dec 2025
SuperligaReading the valuation
The market values John at €750k. Model A, which never saw John during training, estimates €410k: the market value is 83% above that estimate.
That is a factor of ×1.83. 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 €589k, 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.
- Apps
- 21
- Minutes
- 779
- Goals
- 2
- Assists
- 1
- Started
- 6/21
- Min / app
- 37
- Cards
- 1Y 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 John…
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 €750k
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 1,583 attackers
Dashed ring: the attacker median (50th percentile)
Goals per 90
Club goals per 90 minutes played in the two years to the valuation date.
0.23 this player0.26 attacker median44th 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
- €100k
- Jul 2021
- Peak
- €750k
- Dec 2025
- Model target
- €750k
- Dec 2025
- Valuations
- 11
- 3 club changes
Dec 2025: €750k, Aalborg BK. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2021-07-23 | €100k | KRC Genk U21 |
| 2022-04-12 | €200k | KRC Genk |
| 2022-10-05 | €300k | KRC Genk |
| 2022-12-22 | €300k | KRC Genk |
| 2023-05-30 | €350k | KRC Genk |
| 2023-10-02 | €450k | Jong Genk |
| 2023-12-28 | €400k | Jong Genk |
| 2024-06-20 | €350k | Jong Genk |
| 2024-12-09 | €350k | Aalborg BK |
| 2025-06-16 | €350k | Aalborg BK |
| 2025-12-18 | €750k | Aalborg BK |
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
- +0.604
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 →Superliga256 players · median €800k
Valued above 43% of the 256 Superliga players.
See them in the Explorer →Attackers, all leagues1,583 players · median €2.5M
Valued above 24% of the 1,583 attackers.
See them in the Explorer →Where John appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- MarcussenLWFC Fredericia · Superliga€750k
- BruusRBAC Horsens · Superliga€750k
- GrotCFOdense Boldklub · Superliga€750k
- GundelundRBVejle Boldklub · Superliga€750k
- HofmannCFVfL Bochum · attackers€750k
- HanssonLWExcelsior Rotterdam · attackers€750k
- WlodarczykCFExcelsior Rotterdam · attackers€750k
- JassonRWAalborg BK · attackers€750k
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).