Variable definitions for football players
| Variable | Description |
|---|---|
| Dependent variables | |
| MV | Transfermarkt.de crowd valuation of market value in millions of euros |
| TF | Transfer values/fees in millions of euros paid by a club for the football player |
| Personal characteristics | |
| AGE | Age in years |
| FOOT | 1. Left-footedness, 2. Right-footedness, 3. Two-footedness |
| HEIGHT | Player height in cm |
| PPI | Position on the playing field: 1. Midfielder, 2. Forward, 3. Defender |
| CLUBSCORE | UEFA championship points for player's club (in thousands) |
| Performance Variables | |
| LEAGUE | 1. German Bundesliga, 2. Spanish La Liga, 3. French Ligue 1, 4. English Premier League, 5 Italian Serie A |
| APPEAR | Number of appearances of each football player in a year |
| GOALS | Number of goals scored in a season |
| GOAIN | Number of own goals scored in a season |
| ASSIST | Number of first-level assists during the season |
| CARDS | Number of yellow and red cards during the season |
| SUBST | Number of times the player is taken off during a match during a season |
| CHANGE | Number of matches the player comes on as a substitute during a season |
| Popularity variable | |
| INSTAGR | Number of player's Instagram followers (in millions) |
| Negotiation variables | |
| NEGO | Ratio between UEFA championship points of buyer club and seller club |
| AGENT |
|
| Time | |
| YEAR | Level variable for years between 2020 and 2024 |
| Variable | Description |
|---|---|
| MV | Transfermarkt.de crowd valuation of market value in millions of euros |
| TF | Transfer values/fees in millions of euros paid by a club for the football player |
| AGE | Age in years |
| FOOT | 1. Left-footedness, 2. Right-footedness, 3. Two-footedness |
| HEIGHT | Player height in cm |
| PPI | Position on the playing field: 1. Midfielder, 2. Forward, 3. Defender |
| CLUBSCORE | UEFA championship points for player's club (in thousands) |
| LEAGUE | 1. German |
| APPEAR | Number of appearances of each football player in a year |
| GOALS | Number of goals scored in a season |
| GOAIN | Number of own goals scored in a season |
| ASSIST | Number of first-level assists during the season |
| CARDS | Number of yellow and red cards during the season |
| SUBST | Number of times the player is taken off during a match during a season |
| CHANGE | Number of matches the player comes on as a substitute during a season |
| INSTAGR | Number of player's Instagram followers (in millions) |
| NEGO | Ratio between UEFA championship points of buyer club and seller club |
| AGENT | Football player does not have an agent Football player has a professional agent Football is represented by a relative |
| YEAR | Level variable for years between 2020 and 2024 |
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