Context: I was at a talk today where data was presented where a group of sports people ranked their own performance and everyone else in the group. This enabled self-rated performance to be correlated with the average of other-rated performance. The general observation was that there was a strong relationship between the two variables, but that where self-rated performance deviated from other-rated performance, people tended to rate themselves higher.
This raises the question of what this self-other discrepancy represents. One answer is that people have a self-serving bias. Another answer is that people have unique information about themselves.
Question: Thus, I'm interested in studies that have looked at what self-rated performance predicts over and above other-rated performance. In particular:
To what extent does self-rated performance predict objective performance over and above other-rated performance?
I imagine these findings would vary as a function of a range of factors including type of task, number of rated used form the other-rating, and so on. But at first instance, I'd be interested in any empirical examples.