FYI: Since 2002, S&P Dow Jones Indices has published its biannual Indices Versus Active (SPIVA) reports, which compare the performance of actively managed equity funds to their appropriate index benchmarks. It also puts out a pair of scorecards each year that focus on persistence of performance.
This is an important issue, because if persistence is not significantly greater than should be expected at random, investors cannot separate skill-based performance (which might be able to persist) from luck-based performance (which eventually runs out).
Regards,
Ted
https://www.etf.com/sections/index-investor-corner/swedroe-losers-game-reaffirmed
