I am a little unsure of which KPIs they would use in the model. Billy Beane used for the initial stat for his players the OB% which is a very easy stat to work with as a base and then you can add on Hits, RBI, HR etc.
In football do you look at a defenders record and drill down to tackles won? And if you do is that based on minutes played, or a percentage of overall tackles?
For strikers is it a case of Goals Scored/Attempts, or Shots on targets/Total shots?
And I haven't got any idea what you could use for midfielders.
what do OB% Hits RBI and HR all stand for Sing?