Mathemagician
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The brevity was as much for humor as anything. The reality is that one week is meaningless due to nonstationarity. The markets can go perfectly for an awful trading idea or horribly for an outstanding trading idea for a lot longer than a week. Two of the key assumptions that go into calculations of statistical significance are independence and stationarity. Both of these are violated in trading, and this results in extreme difficulty in calculating statistical significance. The net effect of this is that huge and relevant samples must be collected before any reliable statistics can be done.
Heuristically, the noise in the data swamps the signal to a great degree.
jj
Heuristically, the noise in the data swamps the signal to a great degree.
jj