Measuring the percentage increase or decrease in expected threat relative to the zone average, given actual player positioning from 360 data. TAx isolates collective positioning quality independent of ball location. A team with consistently positive TAx creates better attacking situations through positioning; a team with negative TAx creates worse situations despite being in the same zones.
For each action: compute spatial xT (context-adjusted) and standard xT (zone average). TAx = (spatial_xT - standard_xT) / standard_xT. Aggregate per team, per player, per match, per zone.