In the context of Private Equity (PE) fund performance measurement, Limited Partners (LPs) often evaluate the performance of a fund not solely based on its Internal Rate of Return (IRR), but rather by looking at a range of metrics that better reflect its value creation against public market benchmarks.

Consider a Private Equity fund that has generated a net IRR of 15% over a 10-year period. At the same time, the comparable public market index, which reflects similar risk characteristics, has had an annualized return of 10% over the same period. In this scenario, which of the following performance metrics would give the most accurate perspective on the fund's excess return relative to the public market and assist LPs in their assessment of the fund's ability to create value?