PASSES ALLOWED BY DEFENSIVE ACTION (PPDA)
If xGs measure pre-shot probability, xGOTs provide a modified value after the player shoots. That is, from the xG of an occasion, a new value is generated based on the final location of the shot (as long as it goes between sticks), where more value is given to shots that end in the square and less to those that go to the center of the goal . Its value also ranges from 0 to 1.
Known in English as Expected Assists ( xA ),
it is the equivalent of xG but for assists. In other words, it is a metric that measures the probability that a pass ends up being a goal assist , without taking into account the ability of the shooter, depending on factors such as the type of pass (centre, to the gap, between the lines… ), pattern of play (on play, from set pieces), the location of the pass and its destination or the distance of the pass.
It also gives a value from 0 to 1, where 0 is a pass that will never result in an assist and 1 is a pass that the receiver is expected to score every time.
By definition, for a player to be credited with an assist,
the teammate receiving the pass must necessarily score. If not, that pass will not be an assist no matter how good it was. This dependence on the partner is not fair. The xA helps correct this injustice.
Therefore, xAs serve to determine how decisive a player (or team) is through their passing.
Adding up the expected assists of a player (or team) gives us an idea of how many assists they should have given based on the quality of their successful passes. Therefore, the difference between assists and expected assists will tell us if a player (or team) is performing above or below what they should.
It is the number of passes that a team allows its rival before taking a defensive action through a tackle, interception, clearance, etc. A lower value indicates a higher level of pressure, while a higher number indicates a lower level.
It is important to make it clear that this metric is only applied in a certain area of the field,
Which is usually the own field, although here there are also differences between providers.
They help us to know the intensity of a team when it comes to exerting pressure in defensive tasks,
That is, its intention when it comes to wanting to recover the
It is important to clarify that the PPDA does not tell us how well or badly a team does, but simply tells us its style . If you have a low PPDA we will talk about a very intense team in pressure and more passive if your PPDA is high, but that is not necessarily better or worse, but it will depend on what each coach wants for his team.