Andy
Halliday
DMScotland · Motherwell FC
Player dossierPremiership
AndyHalliday
DMDefensive MidfieldMidfield
- Club
- Motherwell FC
- League
- Premiership
- Nationality
- Scotland
- Age
- 34
- Height
- 181 cm
- Foot
- Left
- Valued
- 20 May 2026
Reading the valuation
The market values Halliday at €50k. Model A, which never saw Halliday during training, estimates €90k: the market value is 45% below that estimate.
That is a factor of ×1.81. 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 €252k, 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.
- Apps
- 36
- Minutes
- 2,313
- Goals
- 3
- Assists
- 2
- Started
- 31/36
- Min / app
- 64
- Cards
- 6Y 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 Halliday…
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 €50k
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 1,687 midfielders
Dashed ring: the midfielder median (50th percentile)
Starts
Share of appearances started rather than entered from the bench.
86% this player69% midfielder median80th 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
- €75k
- Jan 2009
- Peak
- €750k
- Jan 2019
- Model target
- €50k
- May 2026
- Valuations
- 27
- 5 club changes
May 2026: €50k, Motherwell FC. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2009-01-06 | €75k | Livingston FC |
| 2009-11-20 | €150k | Livingston FC |
| 2010-10-24 | €500k | Middlesbrough FC |
| 2012-06-22 | €250k | Middlesbrough FC |
| 2013-03-02 | €250k | Middlesbrough FC |
| 2013-07-12 | €500k | Middlesbrough FC |
| 2014-01-08 | €350k | Middlesbrough FC |
| 2015-02-27 | €350k | Bradford City |
| 2015-11-16 | €350k | Rangers FC |
| 2017-02-14 | €500k | Rangers FC |
| 2018-03-04 | €350k | Rangers FC |
| 2018-08-08 | €350k | Rangers FC |
| 2019-01-03 | €750k | Rangers FC |
| 2020-02-05 | €500k | Rangers FC |
| 2020-04-08 | €400k | Rangers FC |
| 2021-01-18 | €400k | Heart of Midlothian FC |
| 2021-06-03 | €400k | Heart of Midlothian FC |
| 2021-12-31 | €375k | Heart of Midlothian FC |
| 2022-06-27 | €550k | Heart of Midlothian FC |
| 2022-12-13 | €550k | Heart of Midlothian FC |
| 2023-06-26 | €500k | Heart of Midlothian FC |
| 2023-12-05 | €300k | Heart of Midlothian FC |
| 2024-05-30 | €250k | Motherwell FC |
| 2024-12-03 | €200k | Motherwell FC |
| 2025-06-17 | €200k | Motherwell FC |
| 2025-12-10 | €150k | Motherwell FC |
| 2026-05-20 | €50k | Motherwell 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
- −0.593
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 →Premiership311 players · median €400k
Valued above 2% of the 311 Premiership players.
See them in the Explorer →Midfielders, all leagues1,687 players · median €2M
Valued above 0% of the 1,687 midfielders.
See them in the Explorer →Where Halliday appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- GordonGKHeart of Midlothian FC · Premiership€50k
- HoilettLWHibernian FC · Premiership€50k
- DouglasLBSt. Johnstone FC · Premiership€50k
- McKenzieRWKilmarnock FC · Premiership€50k
- TavaresCMCD Tondela · midfielders€50k
- AndersenAMSilkeborg IF · midfielders€50k
- PittmanAMLivingston FC · midfielders€50k
- MontanoLMLivingston FC · midfielders€75k
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).