Comment by jetrink

You would be interested in Sabermetrics, which is the use of statistics to quantify the contribution of baseball players to the outcomes of the games they play in. Yacht racing is also a competitive team activity and you could define the productivity of a racer in terms of how much that person's efforts contributed to the position or time their yacht finished a race in. It's a relative measure and would have to be defined relative to other racers or to a fictive 'standard' racer.