Ranked by realised profit over the window you pick, as reported by
the directory this board comes from. Copying costs ~1.6% a round trip,
and past profit does not promise more of it.
We have not run our own hold-out test against
this ordering, so we do not claim it predicts anything. What we did
measure, on a board we ranked ourselves, is on
how we measured this — including that the top
tenth still lost money on the typical trade.