science_trader is right, that 1% means your 9 losses in a row can happen on average once every hundred trades. thats pretty often I would've thought.
also that assumes an even distribution which trading systems rarely exhibit. you refer to losing streaks but streaks actually refer to a situation where series of losers (or winners) are regularly a greater length than would be expected, or happen more frequently than would be expected (if random). You can only suspect that 9 losers in a row is unexpected for your system if it happens twice in 100 trades. but really you will need a lot more trades than that.
also that assumes an even distribution which trading systems rarely exhibit. you refer to losing streaks but streaks actually refer to a situation where series of losers (or winners) are regularly a greater length than would be expected, or happen more frequently than would be expected (if random). You can only suspect that 9 losers in a row is unexpected for your system if it happens twice in 100 trades. but really you will need a lot more trades than that.
