This blog was written on 26/4/2015, after Round 35 of the Premier League 2015/16.
You know that situation when you leave the pitch when your team is winning 2-1? At the end of the 90 minutes the opponents have turned everything around and won the match 2-3. Stubborn as you are you tell your manager and teammates that you DID win the game, having left the field in a winning situation.
Taking those situations into account we can calculate the effectivity of each player in his team: how many goals does his team score when he is on the pitch compared to when is not present? And what impact does he have on the total goal difference?
First, a table of the player with the best goal difference when on the pitch this Premier League season (2015/16):
As you can see, the table only includes players of the best 3 teams (highest in the table that is), and only the ones with a lot of minutes played. It would be a bit more fair to take the more responsible metric of goals and goals conceded per 90 minutes. Taking only players with 400+ minutes we’d get the following list:
When we select only players with at least 400 minutes on the pitch and at least 400 on the bench (or in the stands, or on their Playstation at home):
The same criteria but then separated for goals scored and goals conceded:
If you want to read more about this, @goalimpact has a lot more to say about it and also has a much more complex and extensive algorithm to calculate player impact.
It also corrects the goal difference for opponent’s strength, something that was not applied to this data.
Note2: all raw data comes from DataFactory.