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Expected Threat (xT)

Expected Threat (xT) is an advanced analytical model that measures how much an action increases or decreases the probability of scoring. Unlike xG, which evaluates the probability of a single shot resulting in a goal, xT evaluates ball progression actions such as:
  • Passes
  • Dribbles
  • Carries
The model assigns a threat value to every location on the pitch, representing the likelihood that possession from that location will eventually lead to a goal.

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Core Concept

Each position on the pitch is assigned a value representing its attacking potential. When a player moves the ball from one location to another, the threat value changes. The contribution of the action is calculated as: xT=end−startxT = \text{end} - \text{start} Where:
  • (\text) is the threat value of the starting location
  • (\text) is the threat value of the ending location
If the ball is moved to a more dangerous area, the xT value is positive. If the ball is moved to a less dangerous area, the xT value becomes negative.

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Total Expected Threat

The total xT contribution of a player or team is the sum of the xT values from all actions. Total xT=∑i=1nxTi\text{Total xT} = \sum_{i=1}^{n} xT_i Where:
  • (xT_i) represents the threat contribution of each action
  • (n) represents the number of actions performed

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Expected Threat From Passes

Expected threat generated from successful passes is calculated as: xTpass=∑i=1n(end−start)\text{xT}_\text{pass} = \sum_{i=1}^{n} \left( \text{end} - \text{start} \right) This measures how effectively passes move the ball into more dangerous attacking areas.

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Expected Threat From Failed Passes

Failed passes can generate negative threat when possession is lost. xTfail=∑i=1n(loss−start)\text{xT}_\text{fail} = \sum_{i=1}^{n} \left( \text{loss} - \text{start} \right) Where (\text) represents the threat value after losing possession.

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Average Expected Threat

Average xT measures the average threat added per action. Average xT=Total xTTotal Actions\text{Average xT} = \frac{\text{Total xT}}{\text{Total Actions}}

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Positive and Negative Threat Actions

Actions can be categorized based on their impact. Positive xT=∑xTiwhere xTi>0\text{Positive xT} = \sum xT_i \quad \text{where } xT_i > 0 Negative xT=∑xTiwhere xTi<0\text{Negative xT} = \sum xT_i \quad \text{where } xT_i < 0 Positive values represent attacking progression, while negative values represent loss of attacking potential.

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Tactical Interpretation

Expected Threat helps analysts evaluate:
  • Ball progression quality
  • Attacking creativity
  • Effectiveness of passes and carries
  • Contribution to dangerous attacking zones
Players with high xT values consistently move the ball into high-value attacking zones, increasing the likelihood of creating scoring opportunities.

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Example xT Scenario

Midfielder receives the ball at a midfield location. Threat value of starting location: start=0.02\text{start} = 0.02 Player delivers a forward pass into the attacking third. Threat value of ending location: end=0.15\text{end} = 0.15 The contribution of the action becomes: xT=0.15−0.02=0.13xT = 0.15 - 0.02 = 0.13 This action increases the probability of scoring.

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Spatial Model

The xT model divides the pitch into a grid of zones, where each zone has an associated threat value. Zones closer to the goal typically have higher threat values, while zones deeper in the defensive half have lower threat values.

Passing

Passing actions frequently generate expected threat by progressing the ball forward.

Dribbling

Dribbling actions can also increase threat by advancing the ball into dangerous areas.

Chance Creation

Actions with high xT values often lead to scoring opportunities.

Expected Goals (xG)

xG evaluates the probability of scoring once a shot is taken.