The way to prove someone is not a lucky coin-flipper is to identify them before they flip the coins (or, at the very least, by some attribute that was observabl

The way to prove someone is not a lucky coin-flipper is to identify them before they flip the coins (or, at the very least, by some attribute that was observable before they flipped the coins). For example, "took a class from Ben Graham in 1951" [1] might be such an observable criteria. [1] http://www8.gsb.columbia.edu/rtfiles/cbs/hermes/Buffett1984.pdf http://www8.gsb.columbia.edu/rtfiles/cbs/hermes/Buffett1984....